Questions
In the given circuit, the ratio of voltmeter reading to the ammeter reading is R'. If resistance of ammeter is RA, and that of voltmeter RV, then
a
R=R'+RA
b
R=R'−RA
c
RV=R+RA
d
RV=R−RA
detailed solution
Correct option is B
Let current through R be I0 and voltmeter reading is V0, then R'=V0/I0, also V0=I0 R+RAV0I0=R+RAR'=R+RA ⇒ R=RA −R'Talk to our academic expert!
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In the given circuit, the voltmeter records 5 volt. The resistance of the voltmeter in ohms is
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