A 16-V battery is connected in series with a switch,resistor and coil.If the circuit's time constant is 4.2 × 10−4 s and the final steady current after the switch is closed becomes 2.9 A,what is the value of the inductance?

A) 19 mH B) 2.3 mH C) 0.76 mH D) 1.1 mH E) 7.6 mH A) 19 mH B) 2.3 mH C) 0.76 mH D) 1.1 mH E) 7.6 mH B

What is the minimum frequency with which a 200-turn,flat coil of cross sectional area 380 cm2 can be rotated in a uniform 32-mT magnetic field if the maximum value of the induced emf is to equal 7.9 V?

A) 0.19 Hz B) 2.3 Hz C) 5.2 Hz D) 32 Hz E) 0.032 Hz A) 0.19 Hz B) 2.3 Hz C) 5.2 Hz D) 32 Hz E) 0.032 Hz

Exam 20: Induced Voltages and Inductance

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A 16-V battery is connected in series with a switch,resistor and coil.If the circuit's time constant is 4.2 × 10−⁴ s and the final steady current after the switch is closed becomes 2.9 A,what is the value of the inductance?

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Question 1

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A bar magnet is falling through a loop of wire with constant velocity.The south pole enters first.As the magnet leaves the wire,the induced current (as viewed from above):

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Question 2

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A 9.6-V battery is connected in series with a switch,6.0-Ω resistor and coil.What energy is stored in the coil when the current is 1.6 A? The time constant is 4.3 × 10−⁴ s.

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Question 3

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What is the minimum frequency with which a 200-turn,flat coil of cross sectional area 380 cm² can be rotated in a uniform 32-mT magnetic field if the maximum value of the induced emf is to equal 7.9 V?

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Question 4

Electricity may be generated by rotating a loop of wire between the poles of a magnet.The induced current is greatest when:

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Question 5

When a voltage is generated by rotating a coil in a magnetic field at a constant rate,the period of the voltage equals the time that it takes for the coil to rotate through ________ radians.

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Question 6

A metal rod is falling toward the surface of the Earth near the equator.As it falls,one end of the rod becomes positively charged due to the motional emf of the rod through the Earth's magnetic field.The rod is oriented so that:

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Question 7

The back emf in an electric motor is its maximum value under which condition?

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Question 8

A large jetliner with a wingspan of 37 m flies horizontally and due north at a speed of 190 m/s in a region where the magnetic field of the earth is 56 µT directed 55° below the horizontal.What is the magnitude of the induced emf between the ends of the wing?

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Question 9

An RL circuit has L = 0.45 H and R = 5.5 Ω.It is connected to a battery with ε = 19 V at time t = 0.Find the energy stored in the inductor when the current in the circuit is 0.40 A.

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Question 10

Two loops of wire are arranged so that a changing current in one,the primary,will induce a current in the other,the secondary.The secondary loop has twice as many turns as the primary loop.The current in the primary at this moment is 3 A and increasing.The current in the secondary must be:

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Question 11

A circular loop of wire has its radius reduced in half in time Ät.A uniform magnetic field is at an angle of 60^° to the plane of the coil,and the magnetic field doubles its intensity in the same time interval Ät.During this interval,what happens to the flux through the coil?

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Question 12

The principle or law that says "an induced emf in a circuit loop produces a current whose magnetic field opposes further change of magnetic flux" is credited to:

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Question 13

A motor has an internal resistance of 13 Ω.When running,the motor has a back emf of 35 V and draws a current of 3.9 A.What is the supply voltage in this case?

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Question 14

A square coil,enclosing an area with sides 3.0 cm long,is wrapped with 2500 turns of wire.A uniform magnetic field perpendicular to its plane is turned on and increases to 0.15 T during an interval of 1.9 s.What average voltage is induced in the coil?

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Question 15

A 600-turn circular coil with an area of 0.0700 m² is mounted on a rotating frame that turns at a rate of 20.0 rad/s in the presence of a 0.0300-T uniform magnetic field that is perpendicular to the axis of rotation.What is the instantaneous emf in the coil at the moment that the normal to its plane is at a 35.0° angle to the field?

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Question 16

A circuit consists of a 9.2-mH coil,a 17-Ω resistor,a 6.0-Ω resistor,a 9-V battery and a switch,all in series.What is the time constant of this circuit?

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Question 17

An inductor,battery,resistance,and ammeter and switch are connected in series.If the switch,initially open,is now closed,what is the current's final value?

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Question 18

The wiring in a motor has resistance of 4.0 Ω and produces a back emf of 1.1 V when connected to a 15.0-V battery of negligible resistance.Find the current flow through the motor.

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Question 19

A circular loop (area = 0.20 m²)turns in a uniform magnetic field with B = 0.13 T.At an instant when the angle between the magnetic field and the normal to the plane of the loop is π rads and is decreasing at the rate of 0.50 rad/s,what is the magnitude of the emf induced in the loop?

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Question 20

Showing 1 - 20 of 83

Exam 20: Induced Voltages and Inductance

A 16-V battery is connected in series with a switch,resistor and coil.If the circuit's time constant is 4.2 × 10−4 s and the final steady current after the switch is closed becomes 2.9 A,what is the value of the inductance?

A bar magnet is falling through a loop of wire with constant velocity.The south pole enters first.As the magnet leaves the wire,the induced current (as viewed from above):

A 9.6-V battery is connected in series with a switch,6.0-Ω resistor and coil.What energy is stored in the coil when the current is 1.6 A? The time constant is 4.3 × 10−4 s.

What is the minimum frequency with which a 200-turn,flat coil of cross sectional area 380 cm2 can be rotated in a uniform 32-mT magnetic field if the maximum value of the induced emf is to equal 7.9 V?

Electricity may be generated by rotating a loop of wire between the poles of a magnet.The induced current is greatest when:

When a voltage is generated by rotating a coil in a magnetic field at a constant rate,the period of the voltage equals the time that it takes for the coil to rotate through ________ radians.

A metal rod is falling toward the surface of the Earth near the equator.As it falls,one end of the rod becomes positively charged due to the motional emf of the rod through the Earth's magnetic field.The rod is oriented so that:

The back emf in an electric motor is its maximum value under which condition?

A large jetliner with a wingspan of 37 m flies horizontally and due north at a speed of 190 m/s in a region where the magnetic field of the earth is 56 µT directed 55° below the horizontal.What is the magnitude of the induced emf between the ends of the wing?

An RL circuit has L = 0.45 H and R = 5.5 Ω.It is connected to a battery with ε = 19 V at time t = 0.Find the energy stored in the inductor when the current in the circuit is 0.40 A.

Two loops of wire are arranged so that a changing current in one,the primary,will induce a current in the other,the secondary.The secondary loop has twice as many turns as the primary loop.The current in the primary at this moment is 3 A and increasing.The current in the secondary must be:

A circular loop of wire has its radius reduced in half in time Ät.A uniform magnetic field is at an angle of 60° to the plane of the coil,and the magnetic field doubles its intensity in the same time interval Ät.During this interval,what happens to the flux through the coil?

The principle or law that says "an induced emf in a circuit loop produces a current whose magnetic field opposes further change of magnetic flux" is credited to:

A motor has an internal resistance of 13 Ω.When running,the motor has a back emf of 35 V and draws a current of 3.9 A.What is the supply voltage in this case?

A square coil,enclosing an area with sides 3.0 cm long,is wrapped with 2500 turns of wire.A uniform magnetic field perpendicular to its plane is turned on and increases to 0.15 T during an interval of 1.9 s.What average voltage is induced in the coil?

A circuit consists of a 9.2-mH coil,a 17-Ω resistor,a 6.0-Ω resistor,a 9-V battery and a switch,all in series.What is the time constant of this circuit?

An inductor,battery,resistance,and ammeter and switch are connected in series.If the switch,initially open,is now closed,what is the current's final value?

The wiring in a motor has resistance of 4.0 Ω and produces a back emf of 1.1 V when connected to a 15.0-V battery of negligible resistance.Find the current flow through the motor.

A circular loop (area = 0.20 m2)turns in a uniform magnetic field with B = 0.13 T.At an instant when the angle between the magnetic field and the normal to the plane of the loop is π rads and is decreasing at the rate of 0.50 rad/s,what is the magnitude of the emf induced in the loop?

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

A 16-V battery is connected in series with a switch,resistor and coil.If the circuit's time constant is 4.2 × 10−⁴ s and the final steady current after the switch is closed becomes 2.9 A,what is the value of the inductance?

A 9.6-V battery is connected in series with a switch,6.0-Ω resistor and coil.What energy is stored in the coil when the current is 1.6 A? The time constant is 4.3 × 10−⁴ s.

What is the minimum frequency with which a 200-turn,flat coil of cross sectional area 380 cm² can be rotated in a uniform 32-mT magnetic field if the maximum value of the induced emf is to equal 7.9 V?

A circular loop of wire has its radius reduced in half in time Ät.A uniform magnetic field is at an angle of 60^° to the plane of the coil,and the magnetic field doubles its intensity in the same time interval Ät.During this interval,what happens to the flux through the coil?

A circular loop (area = 0.20 m²)turns in a uniform magnetic field with B = 0.13 T.At an instant when the angle between the magnetic field and the normal to the plane of the loop is π rads and is decreasing at the rate of 0.50 rad/s,what is the magnitude of the emf induced in the loop?