The magnetic flux through a coil changes steadily from 4.0 × 10-5 T ∙ m2 to 5.0 × 10-5 T ∙ m2 in 0.10 s.What emf is induced in this coil?

A) 5.0 × 10-4 V B) 4.0 × 10-4 V C) 1.0 × 10-4 V D) None of the given answers are correct. A) 5.0 × 10-4 V B) 4.0 × 10-4 V C) 1.0 × 10-4 V D) None of the given answers are correct.

Exam 19: Electromagnetic Induction

As shown in the figure,a straight wire carries a current I into the page.The wire passes through the center of a toroidal coil.If the current I is quickly reduced to zero,the direction of the induced current through the resistor R is

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Question 81

A single-turn loop of wire,having a resistance of 8.00 Ω and a cross-sectional area 200 cm²,is perpendicular to a uniform $\vec { B }$ field that increases in magnitude steadily from 0.200 T to 2.800 T in 2.20 seconds.What is the magnitude of the induced current in the loop?

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Question 82

A bar magnet is oriented above a copper ring,as shown in the figure.If the magnet is pulled upward,what is the direction of the current induced in the ring,as viewed from above?

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Question 83

A rectangular coil of N turns,length L = 25 cm,and width w = 15 cm,as shown in the figure,is rotating in a magnetic field of 1.6 T with a frequency of 75 Hz.If the coil develops a maximum emf 56.9 V,what is the value of N?

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Question 84

A conducting rod whose length is ℓ = 1.60 m is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 4.00 Ω as shown in the figure.The rails and the rod are in the plane of the page.A constant uniform $\vec { B }$ field of 2.20 T in magnitude is applied perpendicular to and out of the paper.What is the magnitude of the external force needed to move the rod to the right with a constant speed of 6.00 m/s? $A conducting rod whose length is ℓ = 1.60 m is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 4.00 Ω as shown in the figure.The rails and the rod are in the plane of the page.A constant uniform \vec { B } field of 2.20 T in magnitude is applied perpendicular to and out of the paper.What is the magnitude of the external force needed to move the rod to the right with a constant speed of 6.00 m/s?$

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Question 85

A circular wire ring is situated above a long straight wire,as shown in the figure.The straight wire has a current I flowing to the right,and this current is increasing at a constant rate.Which of the following statements is true?

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Question 86

The magnetic flux through a coil changes steadily from 4.0 × 10^-5 T ∙ m² to 5.0 × 10^-5 T ∙ m² in 0.10 s.What emf is induced in this coil?

(Multiple Choice)

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Question 87

As shown in the figure,a C-shaped conductor is in a uniform magnetic field B out of the page,and the magnitude of B is increasing.What is the polarity of the induced emf in terminals X and Y?

(Multiple Choice)

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Question 88

If the primary coil of a transformer contains more loops than the secondary coil then it is a

(Multiple Choice)

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Question 89

A flat circular loop of radius 0.10 m is rotating in a uniform $\vec { B }$ field of 0.20 T.Find the magnetic flux through the loop when the plane of the loop and the $\vec { B }$ field vector are perpendicular.

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Question 90

You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit.The primary circuit has 130 windings and the secondary circuit is completed through a 55-Ω resistor.How many windings should the secondary circuit contain?

(Short Answer)

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Question 91

A flat coil having 40 turns,each one of cross-sectional area 12.0 cm²,is oriented with its plane perpendicular to a uniform $\vec { B }$ field.The field varies steadily from 0.00 T to 1.20 T in 20.0 ms.What emf is induced in the coil during this time?

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Question 92

As shown in the figure,a uniform magnetic field B is confined to a cylindrical volume of radius 0.050 m.This $\vec { B }$ field is directed into the plane of the page and its magnitude is increasing at a constant rate of $0.900 \mathrm {~T} / \mathrm { s }$ Calculate the magnitude and direction (clockwise or counterclockwise)of the current induced in a circular wire ring of radius 0.16 m and resistance $7.1 \Omega$ that encircles the magnetic field region. $As shown in the figure,a uniform magnetic field B is confined to a cylindrical volume of radius 0.050 m.This \vec { B } field is directed into the plane of the page and its magnitude is increasing at a constant rate of 0.900 \mathrm {~T} / \mathrm { s } Calculate the magnitude and direction (clockwise or counterclockwise)of the current induced in a circular wire ring of radius 0.16 m and resistance 7.1 \Omega that encircles the magnetic field region.$

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Question 93

If the secondary coil of a transformer contains more loops than the primary coil,then it is a

(Multiple Choice)

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Question 94

A bar magnet is close to a solenoid,as shown in the figure.As viewed through the solenoid looking toward the magnet,what is the direction (clockwise or counterclockwise)of the current (if any)induced in the solenoid in each case? (a)The magnet is pushed toward the solenoid. (b)The magnet and solenoid both move to the right at 25 cm/s.

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Question 95

The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns.If the ac voltage applied to the primary coil is 120 V,what voltage is present in its secondary coil?

(Multiple Choice)

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Question 96

As shown in the figure,a large round loop of 269 turns and radius 67.0 cm carries a current of I = $78.0 \mathrm {~A} \text {. }$ A small square loop of 31.0 turns and 1.00 cm on a side is placed at the center of the large loop.If the current in the large loop drops to 0.00 A in 0.0470 s,find the induced emf in the small loop.The square loop is small enough that you can assume that the $\vec { B }$ field in its region is uniform and equal to the $\vec { B }$ field at the center of the round loop.(μ₀ = 4π × 10^-7 T ∙ m/A) $As shown in the figure,a large round loop of 269 turns and radius 67.0 cm carries a current of I = 78.0 \mathrm {~A} \text {. } A small square loop of 31.0 turns and 1.00 cm on a side is placed at the center of the large loop.If the current in the large loop drops to 0.00 A in 0.0470 s,find the induced emf in the small loop.The square loop is small enough that you can assume that the \vec { B } field in its region is uniform and equal to the \vec { B } field at the center of the round loop.(μ<sub>0</sub> = 4π × 10<sup>-7</sup> T ∙ m/A)$

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Question 97

In the figure,a bar magnet moves away from the solenoid.The direction of the induced current through the resistor R is

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Question 98

The coil of an ac generator has 50 loops and a cross-sectional area of 0.25 m².What is the maximum emf that can be generated by this generator if it is spinning with an angular speed of 4.0 rad/s in a 2.0-T $\vec { B }$ field?

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Question 99

Showing 81 - 99 of 99

Exam 19: Electromagnetic Induction

As shown in the figure,a straight wire carries a current I into the page.The wire passes through the center of a toroidal coil.If the current I is quickly reduced to zero,the direction of the induced current through the resistor R is

A single-turn loop of wire,having a resistance of 8.00 Ω and a cross-sectional area 200 cm2,is perpendicular to a uniform B⃗\vec { B }B field that increases in magnitude steadily from 0.200 T to 2.800 T in 2.20 seconds.What is the magnitude of the induced current in the loop?

A bar magnet is oriented above a copper ring,as shown in the figure.If the magnet is pulled upward,what is the direction of the current induced in the ring,as viewed from above?

A rectangular coil of N turns,length L = 25 cm,and width w = 15 cm,as shown in the figure,is rotating in a magnetic field of 1.6 T with a frequency of 75 Hz.If the coil develops a maximum emf 56.9 V,what is the value of N?

A circular wire ring is situated above a long straight wire,as shown in the figure.The straight wire has a current I flowing to the right,and this current is increasing at a constant rate.Which of the following statements is true?

The magnetic flux through a coil changes steadily from 4.0 × 10-5 T ∙ m2 to 5.0 × 10-5 T ∙ m2 in 0.10 s.What emf is induced in this coil?

As shown in the figure,a C-shaped conductor is in a uniform magnetic field B out of the page,and the magnitude of B is increasing.What is the polarity of the induced emf in terminals X and Y?

If the primary coil of a transformer contains more loops than the secondary coil then it is a

A flat circular loop of radius 0.10 m is rotating in a uniform B⃗\vec { B }B field of 0.20 T.Find the magnetic flux through the loop when the plane of the loop and the B⃗\vec { B }B field vector are perpendicular.

You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit.The primary circuit has 130 windings and the secondary circuit is completed through a 55-Ω resistor.How many windings should the secondary circuit contain?

A flat coil having 40 turns,each one of cross-sectional area 12.0 cm2,is oriented with its plane perpendicular to a uniform B⃗\vec { B }B field.The field varies steadily from 0.00 T to 1.20 T in 20.0 ms.What emf is induced in the coil during this time?

If the secondary coil of a transformer contains more loops than the primary coil,then it is a

The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns.If the ac voltage applied to the primary coil is 120 V,what voltage is present in its secondary coil?

In the figure,a bar magnet moves away from the solenoid.The direction of the induced current through the resistor R is

The coil of an ac generator has 50 loops and a cross-sectional area of 0.25 m2.What is the maximum emf that can be generated by this generator if it is spinning with an angular speed of 4.0 rad/s in a 2.0-T B⃗\vec { B }B field?

Introduction

Kinematics: Motion in One Dimension

Newtonian Mechanics

Applying Newtons Laws

Circular Motion

Impulse and Linear Momentum

Work and Energy

Extended Bodies at Rest

Rotational Motion

Gases

Static Fluids

Fluids in Motion

First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Dc Circuits

Magnetism

Vibrational Motion

Mechanical Waves

Reflection and Refraction

Mirrors and Lenses

Wave Optics

Electromagnetic Waves

Special Relativity

Quantum Optics

Atomic Physics

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A single-turn loop of wire,having a resistance of 8.00 Ω and a cross-sectional area 200 cm²,is perpendicular to a uniform $\vec { B }$ field that increases in magnitude steadily from 0.200 T to 2.800 T in 2.20 seconds.What is the magnitude of the induced current in the loop?

The magnetic flux through a coil changes steadily from 4.0 × 10^-5 T ∙ m² to 5.0 × 10^-5 T ∙ m² in 0.10 s.What emf is induced in this coil?

A flat circular loop of radius 0.10 m is rotating in a uniform $\vec { B }$ field of 0.20 T.Find the magnetic flux through the loop when the plane of the loop and the $\vec { B }$ field vector are perpendicular.

A flat coil having 40 turns,each one of cross-sectional area 12.0 cm²,is oriented with its plane perpendicular to a uniform $\vec { B }$ field.The field varies steadily from 0.00 T to 1.20 T in 20.0 ms.What emf is induced in the coil during this time?

The coil of an ac generator has 50 loops and a cross-sectional area of 0.25 m².What is the maximum emf that can be generated by this generator if it is spinning with an angular speed of 4.0 rad/s in a 2.0-T $\vec { B }$ field?