Unit 4 Physics Practice Questions With Answer

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Practice Questions Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. What is the correct mathematical expression for Newton’s Law of Gravitation? a. b. c. d. ____ 2. What is true about the gravitational constant, G ? a. It is believed to be the same everywhere in the universe. b. It applies only near the surface of Earth. c. It applies only within the gravitational field of the Sun. d. It applies only within the gravitational field of the Milky Way galaxy. ____ 3. What are the units of the gravitational constant, G ? a. b. c. d. ____ 4. The value of g can be expressed in which of the following units? a. m/s b. N/kg c. Both (a) and (b). d. Neither (a) nor (b). ____ 5. Which statement is true about the moon? a. It is kept in its orbit by the gravity of Earth. b. It has a velocity parallel to the radius vector. c. It has a velocity of 9.8 m/s. d. It was not considered as a falling body by Sir Isaac Newton. ____ 6. Which of the following is the correct equation for the speed of a satellite in orbit around Earth? a.

b. c. d. ____ 7. Satellite A has twice the orbital speed of Satellite B. What is the ratio of their orbital radii, ? a. b. c. 2 d. 4 ____ 8. Which of the following statements is true about a satellite in geostationary orbit? a. It orbits directly over the poles. b. It appears fixed over the same point on Earth at all times. c. It has a period of orbit of about 48 hours. d. All of the above. ____ 9. Which of the following planets orbits the Sun with the greatest speed? a. Jupiter b. Neptune c. Mercury d. All orbit with the same speed. ____ 10. Which statement is true? a. All protons carry the same amount of negative charge. b. Like charges repel and unlike charges attract. c. All electrons carry the same amount of positive charge. d. All of these. ____ 11. What is true concerning the total charge of a closed system?

a. remains constant b. always neutral c. always positive d. always negative ____ 12. What is the basic SI unit of charge? a. newton b. electron c. coulomb d. proton ____ 13. What is the charge on one electron? a. 1 C b. +1 C c. d. ____ 14. What is the mathematical equation that represents Coulomb’s law? a. b. c. d. ____ 15. What are the correct units for the constant k in Coulomb’s law? a. b. c. d. ____ 16. Two identical electric charges q 1 and q 2 are separated by a distance r . If r is tripled, what happens to the electric force between them? a. triples b. decreases by a factor of 3 c. decreases by a factor of 9 d. increases by a factor of 9 ____ 17. An electric field is created by a point charge . A small positive test charge is a distance r from . What is the equation that gives the magnitude of the electric field at the location of the small test charge?

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a. b. c. d. ____ 18. The magnitude of the electric field a distance r from a point charge q is . What is the magnitude of the magnetic field a distance of 2 r from a particle of charge 3 q ? a. b. c. d. ____ 19. A uniform electric field has a strength of 150 N/C. A charge of 1.20 C is placed in the field. How much work does the field do on the charge in moving it 0.500 m? a. The charge does work on the field. b. 360 J c. 180 J d. 75 J ____ 20. A electric charge moves through an electric field from point P to point Q in a straight line through a distance, d . The field does 24.0 J of work on the charge. Suppose that the charge moved along a different path from A to B through a distance of 2 d . What is the work done in this case? a. 0 J b. 12.0 J c. 24.0 J d. 48.0 J ____ 21. A charge is at vertex A of a hexagon ABCDEF. The charge is in an electric field with uniform strength . The charge moves from point A to point D. Which path results in the largest change in electric potential energy? a. All paths have the same change in electric potential energy. b. A-D

c. A-B-D d. A-B-C-D ____ 22. What is electric potential? a. the kinetic energy per unit charge b. the electric field strength per unit charge c. the work done per unit charge by an electric field d. the electric potential energy per unit charge ____ 23. Which equation gives the electric potential due to a charge q at a distance r ? a. b. c. d. ____ 24. The electric potential due to a unit charge q at a distance r is V . What is the potential due to a charge of 4 q at a distance of 2 r ? a. 2 V b. V c. d. ____ 25. Two identical point charges q are separated by a distance r , and have an electrical potential energy . Each charge is doubled, and the distance between them reduced by half. What is the electric potential energy? a. b. c. d. ____ 26. What is a possible unit for electric potential? a. J b. J/C c. C/J d. N m/C 2 ____ 27. What did Millikan use to bring charged oil drops to rest? a. an electric microbalance b. a static electric field c. batteries of a fixed high voltage d. all of these ____ 28. A charged oil drop is at rest between the plates of a Millikan apparatus. What forces must be included on a FBD of the oil drop? a. the electric and gravitational force

b. the electric, gravitational and normal force c. the electric force only d. the gravitational force only ____ 29. Two plates in a Millikan apparatus are charged to 900 V and separated by a distance of 1.50 cm. What is the magnitude of the electric field between the plates? a. 60 000 N/C b. 1350 N/C c. 600 N/C d. 13.5 N/C ____ 30. In order to calculate the charge on an oil drop, what other quantity did Millikan need to measure? a. the voltage across the plates b. the separation of the plates c. the mass of the drop d. all of these ____ 31. How did Millikan determine the mass of the oil drop? a. by measuring its mass with a spring balance b. by measuring its volume and density c. by measuring its weight d. by measuring its terminal velocity in air ____ 32. Which of the following is true concerning an electron and a proton? a. they have the same mass b. they have the same radius c. they are identical except for the sign of the electric charge d. they have the same magnitude of electric charge ____ 33. Which statement is true about Earth’s magnetic field? a. The magnetic field lines run from geographic north to geographic south. b. The magnetic field lines start and stop at the surface of Earth. c. The north magnetic pole is not in the same location as the north geographic pole.

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d. A compass operates using the electric field of Earth. ____ 34. Which statement is true? a. The magnetic poles of Earth have fixed positions. b. The magnetic poles of Earth have reversed direction many times. c. The magnetic field of Earth is due to its solid iron core. d. The cause of Earth’s magnetic field is completely understood. ____ 35. A positively charged cosmic ray approaches Earth’s magnetic field as shown. In which direction does the magnetic force acting on the particle point? a. toward the top of the page b. toward the bottom of the page c. outward from the page d. inward toward the page ____ 36. A wire is held horizontally from north to south. An electric current in the wire runs southward. A compass need is placed a few centimetres vertically up from the wire. Ignore the magnetic field of Earth. Which way will the compass point? a. north b. south c. west d. east ____ 37. What is the SI unit for the strength of a magnetic field? a. tesla b. coulomb c. newton d. joule ____ 38. An electron is over the equator 100 m above the surface of Earth. It is at rest with respect to the magnetic field lines of Earth. What is true about the force on the electron due to the magnetic field of Earth? a. The force points to the east. b. The force points toward the west. c. The force points upward from the surface of Earth. d. The force equals 0 N. ____ 39. An electron moves through a magnetic field with a velocity , as shown. What direction does the magnetic force on the electron act in?

a. along the negative y -axis b. along the negative x -axis c. along the positive z -axis d. along the negative z -axis ____ 40. A proton with a charge e feels a magnetic force F when moving through a magnetic field. If the speed of the proton is doubled, what is the new magnetic force on the proton? a. 4 F b. 3 F c. 2 F d. F ____ 41. A charge of 30.0 C flows through a segment of wire in 5.00 s. What is the current in the wire? a. 0.167 A b. 5.00 A c. 6.00 A d. 30.0 A ____ 42. A segment of wire carries a current in a magnetic field as shown. What is the direction of the magnetic force on the wire? a. upward out of the page b. downward into the page c. toward the top of the page d. toward the bottom of the page ____ 43. A particle with mass m and charge q is shot into a magnetic field B perpendicular to the field at a speed v . The particle moves in a circle with radius r . Which equation determines the radius of the circle? a. b.

c. d. Short Answer 1. A uniform electric field has a strength of 120 N/C. An alpha particle with a charge 2 e is pushed against the field direction by an external force for a distance of 25 cm. How much potential energy does the alpha particle gain? 2. An electron gun has a uniform electric field of 425 N/C. An electron starts from rest and is fired from the gun, reaching a speed of . How far does the electron move relative to the field? 3. A car battery transferred 60.0 J of energy to 5.00 C of electrons to light up the headlight of a car. What was the voltage of the battery? 4. An alpha particle with a charge of 2 e is fixed at the origin. A proton is aimed at the alpha particle, and shot at it from a distance of 2.00 m at a speed of . How close will the proton come to the alpha particle before coming to a stop? 5. Six point charges each with charge are arranged on the vertices of a hexagon that has a side length of 15.2 cm. What is the electric potential due to the six charges at the centre of the hexagon? 6. An oil drop is balanced in a Millikan apparatus. The drop has a mass of . The plates have a potential difference of 920 V, and are separated by 3.6 cm. What is the charge on the drop? 7. A house is built on the equator with a wire carrying electricity vertically upward to the second story. A charge of 5.0 C of electrons flows upward at 4.6 m/s in the wire. What is the magnitude and direction of the force acting on the charge due to the magnetic field of Earth? 8. A current of 2.10 A flows through a lamp filament 0.800 cm long. The filament is in a magnetic field perpendicular to the filament, which exerts a force on the filament opposite to the force of gravity. If the lamp has a mass of 18.0 g, what field strength would be needed to make the lamp appear weightless?

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Practice Questions Answer Section MULTIPLE CHOICE 1. ANS: C PTS: 1 REF: T/I OBJ: 6.1 Newtonian Gravitation LOC: B2.6 MSC: Analysis and Application 2. ANS: A PTS: 1 REF: K/U OBJ: 6.1 Newtonian Gravitation LOC: D2.2 MSC: Knowledge 3. ANS: B PTS: 1 REF: K/U OBJ: 6.1 Newtonian Gravitation LOC: D2.2 MSC: Knowledge 4. ANS: B PTS: 1 REF: K/U OBJ: 6.2 Orbits LOC: D2.1 MSC: Knowledge 5. ANS: A PTS: 1 REF: K/U OBJ: 6.2 Orbits LOC: D2.2 MSC: Understanding 6. ANS: C PTS: 1 REF: A OBJ: 6.2 Orbits LOC: D2.2 MSC: Knowledge 7. ANS: A PTS: 1 REF: T/I OBJ: 6.2 Orbits LOC: D2.2 MSC: Knowledge 8. ANS: B PTS: 1 REF: A OBJ: 6.2 Orbits LOC: D2.2 MSC: Evaluation 9. ANS: C PTS: 1 REF: A OBJ: 6.2 Orbits LOC: D2.2 MSC: Knowledge 10. ANS: B PTS: 1 REF: K/U OBJ: 7.1 Properties of Electric Charge LOC: D2.1 MSC: Knowledge 11. ANS: A PTS: 1 REF: K/U OBJ: 7.1 Properties of Electric Charge LOC: D2.1 MSC: Understanding 12. ANS: C PTS: 1 REF: K/U OBJ: 7.1 Properties of Electric Charge LOC: D2.1 MSC: Knowledge 13. ANS: C PTS: 1 REF: K/U OBJ: 7.1 Properties of Electric Charge LOC: D2.1 MSC: Knowledge 14. ANS: A PTS: 1 REF: K/U OBJ: 7.2 Coulomb's Law LOC: D2.1 MSC: Knowledge 15. ANS: D PTS: 1 REF: K/U OBJ: 7.2 Coulomb's Law LOC: D2.1 MSC: Knowledge 16. ANS: C PTS: 1 REF: T/I OBJ: 7.2 Coulomb's Law LOC: D2.3 MSC: Analysis and Application 17. ANS: A PTS: 1 REF: K/U OBJ: 7.3 Electric Fields LOC: D2.1 MSC: Knowledge 18. ANS: C PTS: 1 REF: A OBJ: 7.3 Electric Fields LOC: D2.3 MSC: Understanding 19. ANS: B PTS: 1 REF: A OBJ: 7.4 Potential Difference and Electric Potential LOC: D2.3 MSC: Understanding 20. ANS: C PTS: 1 REF: T/I OBJ: 7.4 Potential Difference and Electric Potential LOC: D2.3 MSC: Analysis and Application

21. ANS: A PTS: 1 REF: K/U OBJ: 7.4 Potential Difference and Electric Potential LOC: D2.1 MSC: Understanding 22. ANS: D PTS: 1 REF: K/U OBJ: 7.4 Potential Difference and Electric Potential LOC: D2.1 MSC: Knowledge 23. ANS: A PTS: 1 REF: K/U OBJ: 7.5 Electric Potential and Electric Potential Energy Due to Point Charges LOC: D2.1 MSC: Knowledge 24. ANS: A PTS: 1 REF: A OBJ: 7.5 Electric Potential and Electric Potential Energy Due to Point Charges LOC: D2.3 MSC: Understanding 25. ANS: B PTS: 1 REF: T/I OBJ: 7.5 Electric Potential and Electric Potential Energy Due to Point Charges LOC: D2.3 MSC: Analysis and Application 26. ANS: B PTS: 1 REF: T/I OBJ: 7.5 Electric Potential and Electric Potential Energy Due to Point Charges LOC: D2.3 MSC: Evaluation 27. ANS: A PTS: 1 REF: K/U OBJ: 7.6 The Millikan Oil Drop Experiment LOC: D2.5 MSC: Knowledge 28. ANS: A PTS: 1 REF: K/U OBJ: 7.6 The Millikan Oil Drop Experiment LOC: D2.5 MSC: Understanding 29. ANS: A PTS: 1 REF: A OBJ: 7.6 The Millikan Oil Drop Experiment LOC: D2.5 MSC: Understanding 30. ANS: D PTS: 1 REF: K/U OBJ: 7.6 The Millikan Oil Drop Experiment LOC: D2.5 MSC: Knowledge 31. ANS: D PTS: 1 REF: K/U OBJ: 7.6 The Millikan Oil Drop Experiment LOC: D2.5 MSC: Understanding 32. ANS: D PTS: 1 REF: K/U OBJ: 7.6 The Millikan Oil Drop Experiment LOC: D2.5 MSC: Knowledge 33. ANS: C PTS: 1 REF: C OBJ: 8.1 Magnets and Electromagnets LOC: D2.1 MSC: Evaluation 34. ANS: B PTS: 1 REF: K/U OBJ: 8.1 Magnets and Electromagnets LOC: D2.1 MSC: Evaluation 35. ANS: D PTS: 1 REF: T/I OBJ: 8.1 Magnets and Electromagnets LOC: D2.4 MSC: Analysis and Application 36. ANS: C PTS: 1 REF: A OBJ: 8.1 Magnets and Electromagnets LOC: D3.3 MSC: Understanding 37. ANS: A PTS: 1 REF: K/U OBJ: 8.2 Magnetic Force on Moving Charges LOC: D2.1 MSC: Knowledge 38. ANS: D PTS: 1 REF: T/I OBJ: 8.2 Magnetic Force on Moving Charges LOC: D2.1

MSC: Understanding 39. ANS: D PTS: 1 REF: T/I OBJ: 8.2 Magnetic Force on Moving Charges LOC: D2.4 MSC: Understanding 40. ANS: C PTS: 1 REF: T/I OBJ: 8.2 Magnetic Force on Moving Charges LOC: D2.4 MSC: Understanding 41. ANS: C PTS: 1 REF: A OBJ: 8.3 Magnetic Force on a Current-Carrying Conductor LOC: D2.4 MSC: Understanding 42. ANS: D PTS: 1 REF: A OBJ: 8.3 Magnetic Force on a Current-Carrying Conductor LOC: D2.4 MSC: Understanding 43. ANS: C PTS: 1 REF: K/U OBJ: 8.4 Motion of Charged Particles in Magnetic Fields LOC: D2.4 MSC: Evaluation SHORT ANSWER 1. ANS: Given: Required: Analysis: Solution: Statement: The alpha particle gains . PTS: 1 REF: A OBJ: 7.4 Potential Difference and Electric Potential LOC: D2.3 MSC: Understanding 2. ANS: Given: Required: Analysis: Solution:

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Statement: The electron moved a distance of . PTS: 1 REF: T/I OBJ: 7.4 Potential Difference and Electric Potential LOC: D2.3 MSC: Analysis and Application 3. ANS: Given: Required: V Analysis: Solution: Statement: The voltage of the battery was 12.0 V. PTS: 1 REF: A OBJ: 7.4 Potential Difference and Electric Potential LOC: D2.3 MSC: Understanding 4. ANS: Given: Required: Analysis: Solution:

Statement: The proton will approach within of the alpha particle. PTS: 1 REF: A OBJ: 7.5 Electric Potential and Electric Potential Energy Due to Point Charges LOC: D2.3 MSC: Analysis and Application 5. ANS: Given: Required: V at the centre of the hexagon. Analysis: A hexagon consists of six equilateral triangles. Therefore, each vertex is one side length, s, from the centre, i.e., r = s . Since all six charges are identical, the total potential at the centre is the sum of the potentials from all of the charges. Solution: Statement: The electric potential at the centre of the hexagon is . PTS: 1 REF: A OBJ: 7.5 Electric Potential and Electric Potential Energy Due to Point Charges LOC: D2.3 MSC: Analysis and Application 6. ANS: Given: Required: q Analysis: Solution:

Statement: The charge on the drop is . PTS: 1 REF: T/I OBJ: 7.6 The Millikan Oil Drop Experiment LOC: D2.5 MSC: Analysis and Application 7. ANS: Given: Required : Analysis: Solution: Using the right-hand rule, the direction of the magnetic force on a positive charge would point toward the west. The force on the electrons points toward the east.. Statement: The magnetic force is about [east]. PTS: 1 REF: T/I OBJ: 8.2 Magnetic Force on Moving Charges LOC: D2.4 MSC: Analysis and Application 8. ANS: Given: Required: Analysis: Solution:

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Statement: The strength of the field needed is about . PTS: 1 REF: T/I OBJ: 8.3 Magnetic Force on a Current-Carrying Conductor LOC: D2.4 MSC: Analysis and Application

Unit 4 Physics Practice Questions With Answer

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