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Assertion : At any instant, if the current through an inductor is zero, then the induced emf may not be zero
Reason : An inductor tends to keep the flux (i.e. current) constant
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Important Questions on Electromagnetic Induction
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Assertion : Faraday's copper disc generator is based on dynamic electromagnetic induction.
Reason : Alternating current generator is based on periodic electromagnetic induction.
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Assertion : When a conducting rod moves in uniform transverse magnetic field with uniform speed which is perpendicular to its length, then potential difference may develop across its ends.
Reason : In any conductor, free electrons and free positive ions are available.
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Assertion The quantity possesses dimensions of time.
Reason To reduce the rate of increase of current through a solenoid, we should increase the time constant
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Assertion : An electric field is induced in a closed loop where magnetic field is variable. The induced E is not a conservative field.
Reason : The line integral around the closed loop is non-zero.
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Assertion : Only a change of magnetic flux with time, will maintain an induced current in the coil.
Reason : The presence of a large magnetic flux will maintain an induced current in the coil.
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Assertion : Self-inductance is called the inertia of electricity.
Reason : In a LR circuit, the inductor opposes any change in current.
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Assertion : If a charged particle is released from rest in a time varying magnetic field, it moves in a circle.
Reason : In a time varying magnetic field, conservative electric field is induced.
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Assertion : The possibility of an electric bulb fusing is higher at the time of switch OFF.
Reason : Inductive effects produce a surge at the time of switch-off.
