The current is induced in a closed circuit only if there is _________.
A
change in number of magnetic field lines linked with the circuit.
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B
no change in number of magnetic field lines linked with the circuit.
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C
change in number of gravitational field lines linked with the circuit.
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D
no change in number of gravitational field lines linked with the circuit.
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Solution
The correct option is A change in number of magnetic field lines linked with the circuit. The current is induced in a closed circuit only if there is a change in number of magnetic field lines in the circuit due to electromagnetic induction according to Faraday's law.