Q154 / 160 · TS EAMCET 2008 · Physics

In a galvanometer $5 \%$ of the total current in the circuit passes through it. If the resistance of the galvanometer is $G$, the shunt resistance $S$ connected to the galvanometer is

  • A
    $19 G$
  • Correct answer
    B
    $\frac{G}{19}$
  • C
    $20 G$
  • D
    $\frac{G}{20}$

Solution

Shunt of an ammeter, $$ S=\frac{I_g \times G}{I-I_g} $$ $\begin{aligned} & =\frac{5 \times G}{100-5} \\ & =\frac{G}{19}\end{aligned}$

Hence, the correct answer is option: 'B'.

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