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Question

In a series LCR circuit the frequency of a 10V, AC voltage source is adjusted in such a fashion that the reactanace of the inductor measures 15 Ω and that of the capacitor 11Ω,. If R = 3 Ω the potential difference across the series combination of L and C will be:

A
8 V
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B
10 V
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C
22 V
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D
52 V
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Solution

The correct option is A 8 V
I=VZ=VR2+[XLXC]2=1032+[1511]2
=105=2A
VLVC=I[XLXC]=2[1511]
= 8V

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