A galvanometer has a resistance of 50Ω and a current of 0.01 amp will cause full scale deflection. To convert this into an ammeter with full scale deflection for 5A, we have to connect approximately

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A galvanometer has a resistance of 50Ω and a current of 0.01 amp will cause full scale deflection. To convert this into an ammeter with full scale deflection for 5A, we have to connect approximately

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0.2Ω in parallel

0.2Ω in series

0.1Ω in parallel

0.1Ω in series

answer is B.

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Detailed Solution

$\begin{array}{l} G = 50 {Ωi}_{g} = 0 .01 Ai = 5 A; (n = \frac{i}{i_{g}}) S = \frac{G}{n - 1} \\ s = \frac{50}{500 - 1} = 0 .1 in parallel \end{array}$