Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 23

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Question 1
4 / -1

A coil having n turns & resistance RΩ is connected with a galvanometer of resistance 4RΩ. This combination is moved from a magnetic field W₁ Wb to W₂ Wb in t second. The induced current in the circuit is....

A

B

C

D
Question 2
4 / -1

A
Increases

B
Decreased

C
Remain same

D
Depending on whether the semicircle bulge is towards the resistance or away from it
Question 3
4 / -1

Two co – axial solenoids are made by a pipe of cross sectional area 10 cm² and length 20 cm If one of the solenoid has 300 turns and the other 400 turns, their mutual inductance is........

A

B

C

D
Question 4
4 / -1

In circular coil. when no. of turns is doubled & resistance becomes half of the initial then inductance becomes....

A
4 times

B
2 times

C
8 times

D
No change

Solution
Question 5
4 / -1

When the switch S turned off.

A
Both B₁ and B₂ die out promptly

B
Both B₁ and B₂ die out with some delay

C
B₁ dies out promptly but B₂ with some delay

D
B₂ dies out promptly but B₁ with some delay
Question 6
4 / -1

Two identical circular loops of metal wire are lying on a table near to each other without touching.Loop A carries a current which increasing with time.In response the loop B.......

A
Is repelled by loop A

B
Is attracted by loop A

C
rotates about its centre of mass

D
remains stationary
Question 7
4 / -1

Two identical magnets moving towards a coil, connecting a condenser at rear side shown in fig., with equal speed from opposite sides Then

A
Both plate will be positive

B
There is no charging of condenser

C
Plate 1 will be positive and 2 negative

D
Plate 2 will be positive and 1 negative
Question 8
4 / -1

A rectangular loop with a sliding rod of length 2m & resistance 2Ω. It moves in a uniform magnetic field of 3T perpendicular to plane of loop. The external force required to keep the rod moving with constant velocity of 2ms^-1 is

A
2N

B
4N

C
6N

D
8N
Question 9
4 / -1

As shown in figure after a long time the battery is disconnected and short circuiting the points A & B. The current in circuit after 2ms after the short circuit is.

A

B

C

D

Solution
Question 10
4 / -1

The variation of induced emf with time in a coil if a short bar magnet is moved along its axis with constant velocity is.

A

B

C

D