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Electromagnetic induction

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

Resistance
All of the listed here
Capacitance
Inductance

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Electromagnetic induction
If current in a conductor increases then according to Lenz's law self-induced voltage will

Aid the applied voltage
Tend to decrease the amount of current
Aid the increasing current
Produce current opposite to the increasing current

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Electromagnetic induction
The coefficient of coupling between two air core coils depends on

None of the listed here
Self-inductance of two coils only
Mutual inductance and self inductance of two coils
Mutual inductance between two coils only

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

Apparent power is zero
Any capacitance even if present in the circuit will not be charged
Actual power of the circuit is zero
Relative power is zero

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Electromagnetic induction
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

20 wb
0.2 wb
2 wb
0.02 wb

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Electromagnetic induction
In case of an inductance, current is proportional to

Magnetic field
None of the listed here
Voltage across the inductance
Both of the listed here

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