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A coil of self-inductance $L$ is connected in series with a bulb $B$ and an $A C$ source. Brightness of the bulb decreases when
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The correct answer is:
an iron rod is inserted in the coil
As $Z=\sqrt{R^2+X_L^2}=\sqrt{R^2+(2 \pi f V L)^2}$
As $/=\frac{V}{Z}, P=/^2 R$
i.e., $V \uparrow, L \uparrow \Rightarrow Z \uparrow, / \downarrow$ and $P \downarrow$
As $/=\frac{V}{Z}, P=/^2 R$
i.e., $V \uparrow, L \uparrow \Rightarrow Z \uparrow, / \downarrow$ and $P \downarrow$
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