A) frequency of the AC source is decreased
B) number of turns in the coil is reduced
C) a capacitance of reactance \[{{X}_{C}}={{X}_{L}}\] is included in the same circuit
D) an iron rod is inserted in the coil
Correct Answer: D
Solution :
As \[Z=\sqrt{{{R}^{2}}+X_{L}^{2}}=\sqrt{{{R}^{2}}+{{(2\pi fvL)}^{2}}}\] As\[l=\frac{V}{Z},p={{l}^{2}}R\] i.e.,\[V\uparrow ,L\uparrow \Rightarrow Z\uparrow ,l\downarrow \]and \[P\downarrow \]
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