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Q.

A voltmeter of resistance 1000 $Ω$ gives full scale deflection when a current of 100 mA flow through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full scale deflection is

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a

9000 $Ω$

b

10000 $Ω$

c

11.2 $Ω$

d

111 $Ω$

answer is D.

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Detailed Solution

By using
$\frac{i}{i_{g}} = 1 + \frac{G}{S} \Rightarrow \frac{1}{100 \times 10^{- 3}} = 1 + \frac{1000}{S} \Rightarrow S = \frac{1000}{9} = 111 Ω$

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