Question

A galvanometer of resistance $20\Omega$ is shunted by $2\Omega$ resister. The part of the main current flows through the galvanometer is

• A. 1/10 part
• B. 1/11 part
• C. 1/12 part
• D. 1/13 part

Answer 1

The correct option is B 1/11 part

$Req=\frac{20\times 2}{20+2}=\frac{20}{11}$

Let main current be $i$
$=i\left(\frac{20}{11}\right)=i^1\left(20\right)$

$i^1=\frac{1}{11}i$

$\therefore \frac{1}{11}$ part of current flows through the meter