Answer: Mutual inductance

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Questions

1
The phenomenon due to which there is an induced current in one coil due to the current in a neighbouring coil is?

Answer: Mutual inductance

2
If the current in one coil becomes steady, the current in neighbouring coil is?

Answer: Zero

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3
If the flux linkage in coil 1 is 3Wb and it has 500 turns and the current in coil 2 is 2A, calculate the mutual inductance.

Answer: 750H

6
If a capacitor of capacitance 9.2F has a voltage of 22.5V across it. Calculate the energy of the capacitor.

Answer: 506.25W

8
In the given circuit, what will the voltage be across R3 25 s after the switch is moved to position 2?

Answer: 5.9 V

9
A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?

Answer: 0.5 s

10
An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is

Answer: 0.02 Wb

11
The co-efficient of coupling between two air core coils depends on

Answer: mutual inductance and self inductance of two coils

12
Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.

Answer: 100 N

13
A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be
nearly

Answer: 120 N

14
Which of the following circuit elements will oppose the change in circuit current ?

Answer: Inductance

15
For a purely inductive circuit which of the following is true ?

Answer: Actual power of the circuit is zero

17
The law that the induced e.m.f. and current always oppose the cause producing them is due to

Answer: Lenz

18
A laminated iron core has reduced eddy-current losses because

Answer: the laminations are insulated from each other

19
Mutually inductance between two magnetically-coupled coils depends on

Answer: all of the above

20
The magnitude of the induced e.m.f. in a conductor depends on the

Answer: rate of change of flux-linkages

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