The GPS device in an automobile uses which communication channel? A) Satellite B) Microwave C) Radio frequency D) Infrared
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The GPS device in an automobile uses which communication channel?
A) Satellite
B) Microwave
C) Radio frequency
D) Infrared
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- 10. WHAT ARE THE COMPONENTS OF AN ELECTROMAGNETIC WAVE THAT IS A TRANSVERSE WAVE ? A. ELECTRIC AND A MAGNETIC COMPONENT B. SOUND AND MAGNETIC WAVES C.ELECTRIC AND WAVE COMPONENT D.SOUND AND ELECTRIC COMPONENT 5. A CURRENT MAY BE INDUCED IN A COIL BY A. MOVING ONE END OF THE BAR THROUGH THE COIL B. MOVING THE COIL TOWARD THE ONE ENED OF THE BAR MAGNET C. HOLDING THE COUL NEAR A SECOND COIL WHILE THE ELECTRIC CURRENT IN THE SECOND6. d$m The given equation S E .ds = is called dt (a) Faraday's law (b) Ampere - Maxwell law (c) Gauss's law in electricity (d) Gauss's law in magnetismMri machines use extremely strong magnetic field. These fields must be adjustable to produce high quality images. What might these machines use to generate such field A. Permanent magnets B. Electromagnets C. Induced current
- Energy carried by light Pick those that apply is proportional to the number of photons per second in the light thinking of light as a particle is proportional to the square of the electric field thinking of light as a wave is proportional to the amplitude of the electric field thinking of light as a wave flows perpendicular to both the electric and the magnetic fields associated with the electromagnetic wave flows in the direction of the electric fieldThe production of current with moving magnets and coil of wires presents which concept on electromagnetism? A. Law of charges B. Ohm's Law C. Circuit Analysis D. Electromagnetic inductionWhat happens as an electric current travels through a loop of wire? 1. Creates a moving electric charge surrounded by both magnets and electric fields 2. It creates a static electric charge surrounded by an electric field 3. It creates a magnetic field surrounded by an electric charge
- Q.9 i) In a physics lab, there is burning smell from the circuit.a) What could be the reason for the burning smell? b) If any of the circuit components are damaged and has to be replaced, what is the besttechnique for this. Define this technique. ii) a) Standard potential energy ‘E’ of a voltaic cell is 1.10V, calculate the potentialenergy at the cathode plate if the potential energy at anode plate is – 0.763V.b) Write any two advantage of a temperature measuring device with mercury.4. Explain Lenz’s Law in two sentences. 5. Explain how a generator produce electricity. 6. Explain Maxwell Equations and how it binds electricity and magnetism.27. When light from the Sun is absorbed by a dark surface, the surface re-emits radiation that has (A) a shorter wavelength and lower frequency. (B) a longer wavelength and lower frequency. (C) a shorter wavelength and higher frequency. (D) a longer wavelength and higher frequency. 28. Suppose two light bulbs are designed to draw 100 W and 60 W of power when operated at the same household voltage. Which bulb has the higher resistance? (A) The 100-W bulb. (B) The 60-W bulb. (C) It’s impossible to say without knowing the current. 29. In which of the following materials does sound travel the fastest at room temperature? (A) Air. (B) Helium gas. (C) Sea water. (D) Steel. 30. Suppose the temperature in a room remains constant at 20 ◦C as time passes. An object with initial temperature 80 ◦C is placed in the room. If its temperature drops by 30 ◦C in the first hour, how much further will it drop in the second hour? Assume Newton’s Law of Cooling describes the process. (A) 60 ◦C. (B) 30 ◦C…
- 16.) When you transfer a charge by touching or rubbing you are a. creating direct electrical current b. charging by contact c. charging by induction1. Who formulate a theory of electromagnetic induction, combining the theories of electricity, magnetism, and light as one phenomenon?Describe the origins of the magnetic field of the Earth. Describe what is meant by magnetic field strength and state its unit of measurement in SI units. Select one or more: a. Magnetic field strength is measured in amperes per meter squared. b. О с. d. The magnetic field strength B is the value of the current in the loop per unit area. The magnetic field of the earth is caused by electric currents inside the molten iron core of the Earth. The magnetic field strength B is defined as the force acting per unit current in a wire of unit length when the wire is perpendicular to the magnetic field lines. e. The magnetic field of the earth is caused by Earth's rotation around the Sun. ☐ f. Magnetic field strength is measured in Tesla.