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 isA. `2.95 Omega`B. `4.95 Omega`C. `4.35 Omega`D. `4.25Omega`

A galvonometer of resistance `20 Omega` gives a full scale deflection

1.	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 isA. `2.95 Omega`B. `4.95 Omega`C. `4.35 Omega`D. `4.25Omega`
Answer» 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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