An ammeter gives full deflection when a current of $2\, amp$. flows through it. The resistance of ammeter is $12 \,\Omega$. If the same ammeter is to be used for measuring a maximum current of $5\, amp$., then the ammeter must be connected with a resistance of
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(c) $\frac{i}{{{i_g}}} = 1 + \frac{G}{S}$$ \Rightarrow \,\,\,\frac{5}{2} = 1 + \frac{{12}}{S} \Rightarrow S = 8\,\Omega .$ (In parallel).
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