A galvonometer of resistance `20 Omega` gives a full scale deflection with a current of 0.04A is passed through it. It is derised to convert it into a
A galvonometer of resistance `20 Omega` gives a full scale deflection with a current of 0.04A is passed through it. It is derised to convert it into an ammeter of range 20A . The only shunt available is `0.05 Omega` . The resistance that must be converted in series with the coil of the galvonometer is
A. `2.95 Omega`
B. `4.95 Omega`
C. `4.35 Omega`
D. `4.25Omega`
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Correct Answer - B
In parallel combination potential is same
`therefore I_g (G+R)=(I-I_g)S`
`0.04(20+R)=(20-0.04)0.05`
`therefore R=4.95Omega` .
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