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Q.

An alternating emf of frequency 50Hz is applied to a series LCR circuit of resistance 20Ω  , an inductance of 100mH and a capacitor of 30mF. The correct statement of the following is

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a

current leads applied emf

b

current lags emf

c

current and emf are in the same phase

d

The difference between inductive and capacitive reactance is 50Ω

answer is B.

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Detailed Solution

n = 50Hz  ω = 100πLω = 100×10−3×100π         =  10π1Cω = 130×10−3×100π = 13πLω > 1Cω                       VL >VCSo voltage leads the current
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