There is a voltameter in a circuit. In order to triple its range, the resistance of how much value should be used?
Text Solution
Verified by ExpertsThe correct answer is:
A
If R is the resistance of the voltmeter and I current is flowing through it, then
V = IR
or R = 
If now resistance connected in series is R', then
R + R' = 
R + R' = 3R
∴ R' = 2R
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