University Physics Volume 2
18th Edition
ISBN: 9781938168161
Author: OpenStax
Publisher: OpenStax
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Chapter 9, Problem 29P
The current of an election beam has a measuredcurrent of
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The current of an electron beam has a
measured current of I=39.2 μA with a
radius of 1.74 mm. What is the
magnitude of the current density of the
beam?
Include units in your answer.
A beam contains 5.1 × 10⁹ doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 3.0 × 105 m/s. What is (a) the magnitude of the current density and (b) direction of
the current density J. (c) What additional quantity do you need to calculate the total current i in this ion beam?
What is the current in a wire of radius R = 2.08 mm if the magnitude of the current density is given by (a) Ja = Jor/R and (b) Jp = Jo(1 -
r/R) in which r is the radial distance and Jo = 8.05 × 104 A/m2? (c) Which function maximizes the current
density near the wire's surface?
(a) Number
i
Units
(b) Number
i
Units
(c)
Chapter 9 Solutions
University Physics Volume 2
Ch. 9 - Check Your Understanding Handheld calculators...Ch. 9 - Check Your Understanding Circuit breakers in a...Ch. 9 - Check Your Understanding In Example 9.4, the drift...Ch. 9 - Check Your Understanding The current density is...Ch. 9 - Check Your Understanding Copper wires use...Ch. 9 - Check Your Understanding A strain gauge is an...Ch. 9 - Check Your Understanding The resistance between...Ch. 9 - Check Your Understanding The voltage supplied to...Ch. 9 - Check Your Understanding Electric motors have a...Ch. 9 - Check Your Understanding Is the efficiency of the...
Ch. 9 - Can a wire cany a current and still be...Ch. 9 - Car batteries are rated in ampere-hours (Ah). To...Ch. 9 - When working with high-power electric circuits, it...Ch. 9 - Incandescent light bulbs are being replaced with...Ch. 9 - It was stated that the motion of an electron...Ch. 9 - Electric circuits are sometimes explained using a...Ch. 9 - An incandescent light bulb is partially evacuated....Ch. 9 - The [R drop across a resistor means that there is...Ch. 9 - Do impurities in semiconducting materials listed...Ch. 9 - Does the resistance of an object depend on the...Ch. 9 - If aluminum and copper wires of the same length...Ch. 9 - In Determining Field from Potential, resistance...Ch. 9 - Shown below are the results of an experiment where...Ch. 9 - The current I is measured through a sample of an...Ch. 9 - Common household appliances are rated at 110 V,...Ch. 9 - Your electric bill gives your consumption in units...Ch. 9 - Resistors are commonly rated at 18W,14W,12W ,1 W...Ch. 9 - Ail immersion heater is a small appliance used to...Ch. 9 - What requirement for superconductivity7 makes...Ch. 9 - Name two applications for superconductivity listed...Ch. 9 - A Van de Graaff generator is one of the original...Ch. 9 - A cathode ray tube (CRT) is a device that produces...Ch. 9 - How many electrons flow through a point in a wire...Ch. 9 - A conductor carries a current that is decreasing...Ch. 9 - The quantity of charge through a conductor is...Ch. 9 - The current through a conductor is modeled as...Ch. 9 - The charge on a capacitor in a circuit is modeled...Ch. 9 - An aluminum wire 1.628 mm in diameter (14-gauge)...Ch. 9 - The current of an election beam has a...Ch. 9 - A high-energy proton accelerator produces a proton...Ch. 9 - Consider a wire of a circular cross-section with a...Ch. 9 - The current of an electron beam has a measured...Ch. 9 - The current supplied to an ail conditioner unit is...Ch. 9 - What current flows through the bulb of a 3.00-V...Ch. 9 - Calculate the effective resistance of a pocket...Ch. 9 - How many volts are supplied to operate an...Ch. 9 - What is the resistance of a 20.0-m-long piece of...Ch. 9 - The diameter of 0-gauge copper wire is 8.252 mm....Ch. 9 - If the 0. 10.0-mm-diameter tungsten filament in a...Ch. 9 - A lead rod has a length of 30.00 cm and a...Ch. 9 - Find the ratio of the diameter of aluminum to...Ch. 9 - What current flows through a 2.54-cm-diameter rod...Ch. 9 - (a) To what temperature must you raise a copper...Ch. 9 - A resistor made of nichrome wire is used in an...Ch. 9 - Of what material is a resistor made if its...Ch. 9 - An electronic device designed to operate at any...Ch. 9 - (a) Of what material is a wire made, if it is 25.0...Ch. 9 - Assuming a constant temperature coefficient of...Ch. 9 - A copper wire has a resistance of 0.500 at 20.0°C...Ch. 9 - A 2.2-k resistor is connected across a D cell...Ch. 9 - A resistor rated at 250 k is connected across two...Ch. 9 - A resistor is connected in series with a power...Ch. 9 - A resistor is placed in a circuit with an...Ch. 9 - The following table show the measurements of a...Ch. 9 - A 20.00-V battery is used to supply current to a...Ch. 9 - What is the maximum voltage that can be applied to...Ch. 9 - A heater is being designed that uses a coil of...Ch. 9 - An alternative to CFL bulbs and incandescent bulbs...Ch. 9 - The power dissipated by a resistor with a...Ch. 9 - Running late to catch a plane, a driver...Ch. 9 - SI. A physics student has a single-occupancy dorm...Ch. 9 - A 0.50-W, 220- resistor carries the...Ch. 9 - Consider a power plant is located 60 km away from...Ch. 9 - A wire is drawn through a die, stretching it to...Ch. 9 - Digital medical thermometers determine temperature...Ch. 9 - Electrical power generators are sometimes "load...Ch. 9 - A 12-guage gold wire has a length of 1 meter. (a)...Ch. 9 - What is the change in temperature required to...Ch. 9 - A coaxial cable consists of an inner conductor...Ch. 9 - A 10.00-meter long wire cable that is made of...Ch. 9 - A nichrome rod that is 3.00 mm long with a cross...Ch. 9 - The temperature in Philadelphia, PA can vary...Ch. 9 - When 100.0 V is applied across a 5-gauge (diameter...Ch. 9 - A wire with a resistance of 5.0 is drawn out...Ch. 9 - What is the resistivity of a wire of 5-gauge wire...Ch. 9 - Coils are often used in electrical and electronic...Ch. 9 - Currents of approximately 0.06 A can be...Ch. 9 - A 20.00-ohm; 5.00-watt resistor is placed in...Ch. 9 - A battery with an emf of 24.00 V delivers a...Ch. 9 - A 12.00-V battery has an internal resistance of a...Ch. 9 - A 10-gauge copper wire has a cross-sectional area...Ch. 9 - The current through a 12-gauge wire is given as...Ch. 9 - A particle accelerator produces a beam with a...Ch. 9 - In this chapter, most examples and problems...Ch. 9 - A current of I= 25A is drawn from a 100-V...Ch. 9 - Consider a square rod of material with sides of...Ch. 9 - A resistor of an unknown resistance is placed in...Ch. 9 - The charge that flows through a point in a wire as...Ch. 9 - Consider a resistor made from a hollow cylinder of...Ch. 9 - What is the current through a cylindrical wire of...Ch. 9 - A student uses a 100.00-W, 115.00-V radiant heater...Ch. 9 - A 12-V car battery is used to power a 20.00-W,...Ch. 9 - A physics student uses a 115.00-V immersion heater...
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- The diameter of the copper wire is h=1.3 mm . It carries 2.68 A constant current. There are 8.5×1028 free electrons in copper per cubic meter. What is the cross-sectional area of the wire (μm2 )?arrow_forwardWhat is the current through a cylindrical wire of radius R = 0.1 mm if the current density is J = J0 R r , where J0 = 32000 A m2 ?arrow_forwardPlease asap ?arrow_forward
- A beam contains 2.0 × 109 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 3.1 × 105 m/s. What is (a) the magnitude of the current density and (b) direction of the current density J→. (c) What additional quantity do you need to calculate the total current i in this ion beam?arrow_forwardQ.no.7: A beam contains 2.0 × 108doubly charged posi-tive ions per cubic centimeter, all of which are moving north with a speed of 1.0 × 105 m/s. What are the (a) magnitude and (b) direc-tion of the current density J→? (c) What additional quantity do you need to calculate the total current i in this ion beam?arrow_forwardWhat is the current in a wire of radius R = 3.08 mm if the magnitude of the current density is given by (a) Ja = Jor/R and (b) J = Jo(1-r/R) in which r is the radial distance and Jo = 3.50 x 104 A/m²? (c) Which function maximizes the current density near the wire's surface? (a) Number i (b) Number i Units Unitsarrow_forward
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- What is the current in a wire of radius R = 4.48 mm if the magnitude of the current density is given by (a) Ja = J0r/R and (b) Jb = J0(1 - r/R) in which r is the radial distance and J0 = 7.93 × 104 A/m2? (c) Which function maximizes the currentdensity near the wire’s surface?arrow_forwardThe quantity of charge q (in coulombs) that has passed through a surface of area 1.96 cm2 varies with time according to the equation q 4t3 + 5t + 6, where t is in seconds. (a) What is the instantaneous current through the surface at t = 1.00 s? (b) What is the value of the current density? KA/m2arrow_forwardA beam contains 8.1 × 107 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 2.3 × 105 m/s. What is (a) the magnitude of the current density and (b) direction of the current density J. (c) What additional quantity do you need to calculate the total current i in this ion beam? (a) Number (b) (c) > Unitsarrow_forward
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