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  4. A coil and a bulb are connected in series with a 12 volt direct current source. A soft iron core is now inserted in the coil. Then

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Q. A coil and a bulb are connected in series with a $12$ volt direct current source. A soft iron core is now inserted in the coil. Then

Alternating Current

Solution:

Intensity of bulb remains the same because source is $D C$, so steady state current will be independent of the inductance of the inductor for $D C$ circuit,
$i_{\text {steady }}=\frac{E_{\text {source }}}{R_{\text {bulb }}}$