HARD

JEE Main

IMPORTANT

Earn 100

A long solenoid of radius $R$ carries a time $(t)$ dependent current $I (t) = I_{0} t (1 - t)$ . A ring of radius $2 R$ is placed coaxially near its middle. During the time interval $0 \leq t \leq 1,$ the induced current $(I_{R})$ and the induced $E M F (V_{R})$ in the ring change as:

66.67% studentsanswered this correctly

Important Questions on Electromagnetic Induction and Alternating Currents

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 16 - Electromagnetic Induction and Alternating Currents>JEE Main - 7th January 2020 Shift 1>Q 67

A loop

A B C D E F A

of straight edges has six corner points

A (0, 0, 0), B (5, 0, 0), C (5, 5, 0), D (0, 5, 0), E (0, 5, 5)

and

F (0, 0, 5)

. The magnetic field in this region is

\vec{B} = (3 \hat{i} + 4 \hat{k}) T

. The quantity of flux through the loop

A B C D E F A

(in

W b

) is _____________

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 16 - Electromagnetic Induction and Alternating Currents>JEE Main - 7th January 2020 Shift 2>Q 68

An emf of

20 V

is applied at time

t = 0

to a circuit containing in series

10 m H

inductor and

5 Ω

resistor. The ratio of the currents at time

t = \infty

and at

t = 40 s

is close to: (Take

e^{2} = 7.389

)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 16 - Electromagnetic Induction and Alternating Currents>JEE Main - 7th January 2020 Shift 2>Q 69

A planar loop of wire rotates in a uniform magnetic field. Initially, at

t = 0

, the plane of the loop is perpendicular to the magnetic field. If it rotates with a period of

10 s

about an axis in its plane then the magnitude of induced emf will be maximum and minimum, respectively at:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 16 - Electromagnetic Induction and Alternating Currents>JEE Main - 8th January 2020 Shift 1>Q 70

At time

t = 0

magnetic field of

1000 G a u s s

is passing perpendicularly through the area defined by the closed loop shown in the figure. If the magnetic field reduces linearly to

500 G a u s s,

in the next

5 s,

then induced

E M F

in the loop is:
Question Image

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 16 - Electromagnetic Induction and Alternating Currents>JEE Main - 8th January 2020 Shift 2>Q 71

Question Image
As shown in the figure, a battery of emf $\in$ is connected to an inductor $L$ and resistance $R$ in series. The switch is closed at $t = 0 .$ The total charge that flows from the battery, between $t = 0$ and $t = τ$ ( $τ$ is the time constant of the circuit) is:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 16 - Electromagnetic Induction and Alternating Currents>JEE Main - 9th January 2020 Shift 1>Q 72

In a fluorescent lamp choke (a small transformer)

100 V

of reverse voltage is produced when the choke current changes uniformly from

0 .25 A

0

in a duration of

0 .025 ms

. The self-inductance of the choke (in

mH

) is estimated to be ________

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 16 - Electromagnetic Induction and Alternating Currents>JEE Main - 9th January 2020 Shift 2>Q 73

L C

circuit the inductance

L = 40 mH

and capacitance

C = 100 μF .

If a voltage

V (t) = 10 s i n (314 t)

is applied to the circuit, the current in the circuit is given as:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 16 - Electromagnetic Induction and Alternating Currents>JEE Main - 9th April 2019 Shift 1>Q 74

The total number of turns and cross-section area in a solenoid is fixed. However, its length

L

is varied by adjusting the separation between windings. The inductance of solenoid will be proportional to:

A long solenoid of radius R carries a time t dependent current It=I0t1-t . A ring of radius 2R is placed coaxially near its middle. During the time interval 0≤t≤1, the induced current IR and the induced EMFVR in the ring change as:

Important Questions on Electromagnetic Induction and Alternating Currents

Learn and Prepare for any exam you want !

A long solenoid of radius $R$ carries a time $(t)$ dependent current $I (t) = I_{0} t (1 - t)$ . A ring of radius $2 R$ is placed coaxially near its middle. During the time interval $0 \leq t \leq 1,$ the induced current $(I_{R})$ and the induced $E M F (V_{R})$ in the ring change as: