Question

In conversion of moving coil galvanometer into an ammeter of required range, the resistance of ammeter, so formed is ______.
[S = shunt and G = resistance of galvanometer]

पर्याय

• ${\displaystyle \frac{\text{S + G}}{\text{SG}}}$

• ${\displaystyle \frac{\text{SG}}{\text{S + G}}}$

• ${\displaystyle \frac{\text{S - G}}{\text{SG}}}$

• ${\displaystyle \frac{\text{SG}}{\text{S - G}}}$

Answer 1

In conversion of moving coil galvanometer into an ammeter of required range, the resistance of ammeter, so formed is ${\displaystyle \underline{\frac{\text{SG}}{\text{S + G}}}}$.

Explanation:

A moving coil galvanometer can be converted into an ammeter by connecting a low resistance (called shunt resistance) in parallel to it.

Hence, the resistance (R) of the ammeter, so formed is

${\displaystyle \frac{1}{\text{R}}=\frac{1}{\text{S}}+\frac{1}{\text{G}}}$

R = ${\displaystyle \frac{\text{SG}}{\text{S + G}}}$