Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 39

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Question 1
4 / -1

In circular coil, when no. of turns is doubled and resistance becomes 1/4 th of initial, then inductance becomes

A
4 times

B
2 times

C
8 times

D
No change

Solution
Question 2
4 / -1

A capacitor is fully charged with a battery. Then the battery is removed and a coil is connected with the capacitor in parallel, current varies as

A
Increases monotonically

B
Decreases monotonically

C
Zero

D
Oscillates indefinitely
Question 3
4 / -1

In the figure magnetic energy stored in the coil is

A
Zero

B
Infinite

C
25 joules

D
None of these

Solution
Question 4
4 / -1

In an LR-circuit, time constant is that time in which current grows from zero to the value (where I₀ is the steady state current)

A
0.63 I₀

B
0.50 I₀

C
0.37 I₀

D
I₀

Solution
Question 5
4 / -1

The coefficient of mutual inductance of two coils is 6 mH. If the current flowing in one is 2 ampere, then the induced e.m.f. in the second coil will be

A
3 mV

B
2 mV

C
3 V

D
Zero
Question 6
4 / -1

A L – R circuit has a cell of e.m.f. E, which is switched on at time t = 0. The current in the circuit after a long time will be

A
Zero

B

C

D
Question 7
4 / -1

Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

A
The currents in the two coils

B
The rates at which currents are changing in the two coils

C
Relative position and orientation of the two coils

D
The materials of the wires of the coils
Question 8
4 / -1

When the current changes from +2A to –2A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is

A
0.1 H

B
0.2 H

C
0.4 H

D
0.8 H

Solution
Question 9
4 / -1

An inductance L and a resistance R are first connected to a battery. After sometime the battery is disconnected but L and R remain connected in a closed circuit. Then the current reduces to 37% of its initial value in

A
RL sec

B
R / L sec

C
L / R sec

D
1 / LR sec

Solution
Question 10
4 / -1

Why the current does not rise immediately in a circuit containing inductance?

A
Because of induced e.m.f.

B
Because of high voltage drop

C
Because of low power consumption

D
Because of Joule heating