A galvanometer with a coil resistance of 100 $Ω$ gives a full scale deflection when a current of 1 mA is passed through it. The resistance of the shunt needed in ohm to convert this galvanometer into an ammeter of range 10 A is nearly

0.01

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0.001

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0.1

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0.099

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Solution

The correct option is A 0.01
Let the resistance be connected be X
= $\frac{100 x}{100 + x} = R e q$
= $100 (\frac{100 x}{100 + x}) = 10^{- 3} (100)$
= 10000x=100+x
=9999x=100
= $x = 0.01 Ω$

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A galvanometer with a coil resistance of 100 Ω gives a full scale deflection when a current of 1 mA is passed through it. The resistance of the shunt needed in ohm to convert this galvanometer into an ammeter of range 10 A is nearly

The correct option is A 0.01Let the resistance be connected be X=100x100+x=Req = 100(100x100+x)=10−3(100) = 10000x=100+x =9999x=100 = x=0.01Ω

A galvanometer with a coil resistance of 100 $Ω$ gives a full scale deflection when a current of 1 mA is passed through it. The resistance of the shunt needed in ohm to convert this galvanometer into an ammeter of range 10 A is nearly

The correct option is A 0.01
Let the resistance be connected be X
= $\frac{100 x}{100 + x} = R e q$
= $100 (\frac{100 x}{100 + x}) = 10^{- 3} (100)$
= 10000x=100+x
=9999x=100
= $x = 0.01 Ω$