First slide

Moving coil Galvanometer

Question

An ammeter gives full deflection when a current of 2 A flows through it. The resistance of ammeter is $12 Ω$ . If the same ammeter is to be used for measuring a maximum current of 5 A, then the ammeter must be connected with a resistance of

Easy

A

$8 Ω$ in series
B

$18 Ω$ in series
C

$8 Ω$ in parllel
D

$18 Ω$ in parallel

Solution

$\frac{i}{i_{g}} = 1 + \frac{G}{S} \Rightarrow \frac{5}{2} = 1 + \frac{12}{S} \Rightarrow S = 8 Ω (In parallel)$

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