Question

A moving coil voltmeter is generally used to measure the potential difference across a conductor of resistance $r$ carrying a current $i$. The resistance of voltmeter is $R$. For more correct measurement of potential difference :

• A. $R=r$
• B. $R>>r$
• C. $R<<r$
• D. $R=0$

Answer 1

Answer: (B)

$R>>r$

$V=ir$
for getting most of $i$
$R>>r$