A galvanometer whose resistance is 120 gives full scale deflectio… - Vidyadip

MCQ

A galvanometer whose resistance is $120 \Omega$ gives full scale deflection with a current of $0.05 A$ so that it can read a maximum current of $10 \mathrm{~A}$. A shunt resistance is added in parallel with it. The resistance of the ammeter so formed is

A
$0.06 \Omega$
B
$0.006 \Omega$
✓
$0.6 \Omega$
D
$6 \Omega \mathrm{s}$

✓

Answer

Correct option: C.

$0.6 \Omega$

(c) Resistance of shunted ammeter $=\frac{G S}{G+S}$Also $\frac{i}{i_g}=1+\frac{G}{S} \Rightarrow \frac{G S}{G+S}=\frac{i_g \cdot G}{i}$$\Rightarrow \frac{G S}{G+S}=\frac{0.05 \times 120}{10}=0.6 \Omega$

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