In the figure,a lamp $P$ is in series with an iron-core inductor $L$. When the switch $S$ is closed,the brightness of the lamp rises relatively slowly to its full brightness compared to the case without the inductor. This is due to:
- Athe low resistance of $P$
- Bthe induced $emf$ in $L$
- Cthe low resistance of $L$
- Dthe high voltage of the battery $B$
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