A 13-V battery is connected in series with a switch,resistor and coil.If the circuit's time constant is 1.2 × 10−4 s and the final steady current after the switch is closed becomes 2.5 A,what is the value of the inductance?

A) 3.9E-3 H B) 6.2E-4 H C) 2.3E-1 H D) 2.7E-3 H E) 2.3E-5 H A) 3.9E-3 H B) 6.2E-4 H C) 2.3E-1 H D) 2.7E-3 H E) 2.3E-5 H

Exam 20: Induced Voltages and Inductance

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.

(Multiple Choice)

4.9/5

(75)

Question 61

A 0.200-m wire is moved parallel to a 0.500-T magnetic field at a speed of 1.50 m/s.What emf is induced across the ends of the wire?

(Multiple Choice)

4.9/5

(82)

Question 62

The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from 2.0 × 10^-3 T to 3.5 × 10^-3 T in 0.47 s.What is the induced emf in the wire?

(Multiple Choice)

4.7/5

(75)

Question 63

In the United States,the value of ω for commercially generated power is ________ in SI units.

(Multiple Choice)

4.7/5

(85)

Question 64

An airplane with a wingspan of 79.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.490 × l0−⁴ T.If the induced potential between wingtips is 0.875 V,what is the plane's speed?

(Multiple Choice)

4.8/5

(82)

Question 65

Superconductors have been discussed as a means for electrical energy storage.Because they are resistanceless,a current once started in a loop would continue without loss.If a current of 1.0 × 10⁴ A were started in a huge toroidal coil of radius 1.0 km and inductance 50 H,how much electrical energy (in kWh)could be stored?

(Multiple Choice)

4.9/5

(89)

Question 66

What is the stored energy in a 0.50-mH coil carrying a current of 5.0 A?

(Multiple Choice)

4.8/5

(89)

Question 67

A straight wire of length l is oriented east-west and is in a magnetic field B pointing north.The wire is moving downward at a constant speed v.If the resistance of the rod is R,what is the current through the rod?

(Multiple Choice)

4.7/5

(88)

Question 68

A 13-V battery is connected in series with a switch,resistor and coil.If the circuit's time constant is 1.2 × 10−⁴ s and the final steady current after the switch is closed becomes 2.5 A,what is the value of the inductance?

(Multiple Choice)

4.8/5

(91)

Question 69

A motor has an internal resistance of 12.0 Ω.When running,the motor has a back emf of 29 V and draws a current of 3.7 A.What is the supply voltage in this case?

(Multiple Choice)

4.9/5

(76)

Question 70

A bar magnet is falling through a loop of wire with constant velocity.The north pole enters first.The induced current will be greatest in magnitude when the magnet is located so that

(Multiple Choice)

4.8/5

(80)

Question 71

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.As long as the current in the primary is steady at 3.0 A,the current in the secondary will be

(Multiple Choice)

4.9/5

(86)

Question 72

If the rotating coil used in a generator has its radius doubled,what change results in the amplitude of the voltage produced?

(Multiple Choice)

4.7/5

(86)

Question 73

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:

(Multiple Choice)

4.8/5

(92)

Question 74

The operation of an electric motor depends on which of the following effects?

(Multiple Choice)

4.9/5

(93)

Question 75

If the induced current in a wire loop were such that the flux it produces were in the same direction as the change in external flux causing the current,which of the following conservation laws would end up being violated?

(Multiple Choice)

4.8/5

(79)

Question 76

How is the energy stored in a current-carrying inductor related to the current value,I?

(Multiple Choice)

4.7/5

(69)

Question 77

A coil is placed in a magnetic field and has a flux Φ_B through it.The coil is stressed so that its area reduces to 75% of its original value.If the plane of the coil stays the same and the flux through it remains the same,how must the magnetic field change?

(Multiple Choice)

4.9/5

(76)

Question 78

A 580-turn circular coil with an area of 0.0550 m² is mounted on a rotating frame,which turns at a rate of 17.0 rad/s in the presence of a 0.0400-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 50.0° angle to the field?

(Multiple Choice)

4.8/5

(73)

Question 79

A wire loop of radius 0.250 m is placed in a uniform magnetic field of magnitude 0.740 T. The field is directed perpendicular to the plane of the loop. -If the area of the loop increases at a rate of area 1.50 * 10^-3 m²/s,what is the magnitude of the emf induced in the coil?

(Multiple Choice)

4.7/5

(73)

Question 80

Showing 61 - 80 of 91

Exam 20: Induced Voltages and Inductance

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 0.200-m wire is moved parallel to a 0.500-T magnetic field at a speed of 1.50 m/s.What emf is induced across the ends of the wire?

The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from 2.0 × 10-3 T to 3.5 × 10-3 T in 0.47 s.What is the induced emf in the wire?

In the United States,the value of ω for commercially generated power is ________ in SI units.

An airplane with a wingspan of 79.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.490 × l0−4 T.If the induced potential between wingtips is 0.875 V,what is the plane's speed?

What is the stored energy in a 0.50-mH coil carrying a current of 5.0 A?

A straight wire of length l is oriented east-west and is in a magnetic field B pointing north.The wire is moving downward at a constant speed v.If the resistance of the rod is R,what is the current through the rod?

A 13-V battery is connected in series with a switch,resistor and coil.If the circuit's time constant is 1.2 × 10−4 s and the final steady current after the switch is closed becomes 2.5 A,what is the value of the inductance?

A motor has an internal resistance of 12.0 Ω.When running,the motor has a back emf of 29 V and draws a current of 3.7 A.What is the supply voltage in this case?

A bar magnet is falling through a loop of wire with constant velocity.The north pole enters first.The induced current will be greatest in magnitude when the magnet is located so that

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.As long as the current in the primary is steady at 3.0 A,the current in the secondary will be

If the rotating coil used in a generator has its radius doubled,what change results in the amplitude of the voltage produced?

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:

The operation of an electric motor depends on which of the following effects?

If the induced current in a wire loop were such that the flux it produces were in the same direction as the change in external flux causing the current,which of the following conservation laws would end up being violated?

How is the energy stored in a current-carrying inductor related to the current value,I?

A coil is placed in a magnetic field and has a flux ΦB through it.The coil is stressed so that its area reduces to 75% of its original value.If the plane of the coil stays the same and the flux through it remains the same,how must the magnetic field change?

A wire loop of radius 0.250 m is placed in a uniform magnetic field of magnitude 0.740 T. The field is directed perpendicular to the plane of the loop. -If the area of the loop increases at a rate of area 1.50 * 10-3 m2/s,what is the magnitude of the emf induced in the coil?

Units, Trigonometry, and Vectors

Motion in One Dimension

Motion in Two Dimensions

Newtons Laws of Motion

Energy

Momentum, Impulse, and Collisions

Rotational Motion and Gravitation

Rotational Equilibrium and Dynamics

Fluids and Solids

Thermal Physics

Energy in Thermal Processes

The Laws of Thermodynamics

Vibrations and Waves

Sound

Electric Forces and Fields

Electrical Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetism

Alternating-Current Circuits and Electromagnetic Waves

Reflection and Refraction of Light

Mirrors and Lenses

Wave Optics

Optical Instruments

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics

Nuclear Energy and Elementary Particles

Filters

The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from 2.0 × 10^-3 T to 3.5 × 10^-3 T in 0.47 s.What is the induced emf in the wire?

An airplane with a wingspan of 79.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.490 × l0−⁴ T.If the induced potential between wingtips is 0.875 V,what is the plane's speed?

A 13-V battery is connected in series with a switch,resistor and coil.If the circuit's time constant is 1.2 × 10−⁴ s and the final steady current after the switch is closed becomes 2.5 A,what is the value of the inductance?

A coil is placed in a magnetic field and has a flux Φ_B through it.The coil is stressed so that its area reduces to 75% of its original value.If the plane of the coil stays the same and the flux through it remains the same,how must the magnetic field change?

A wire loop of radius 0.250 m is placed in a uniform magnetic field of magnitude 0.740 T. The field is directed perpendicular to the plane of the loop. -If the area of the loop increases at a rate of area 1.50 * 10^-3 m²/s,what is the magnitude of the emf induced in the coil?