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Question

In a given R-L-C circuit where R=30Ω
L=20mH and C=503μF

A
reading of Ammeter is 25A
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B
reading of voltmeter V1 is 610 V
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C
reading of voltmeter V2 is 8V
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D
potential difference across AB can be greater than 20V at an instant.
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Solution

The correct options are
B reading of voltmeter V1 is 610 V
D potential difference across AB can be greater than 20V at an instant.
XL=ωL=20Ω,
XC=1ωc=60Ω
z=302+(6020)2=50i=20sinωt50=25sinωt,irms=25V1=irmsZ1=25302+602=610VV2=irmsZ1=25×40=82V1 max=V12=610×2=26.8
So V1 can take a value of 20 V.

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