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Assertion (A) : In a coil with a d.c source, after closing the key(K), if it is pressed continuously for long time there will be steady deflection of galvanometer included in the circuit.
Reason( R) : When there is a steady current in a coil, the magnetic flux associated with it is zero

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A and R are true and R is the correct explanation of A

A is true R is false

A and R are true but R is not the correct explanation of A

A is false R is true

answer is C.

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Detailed Solution

When current in circuit is constant, there is no change of magnetic flux in the coil $\Rightarrow$ no emf is induced in it

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