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When 500u A current is passed through a ...

When 500`u` A current is passed through a galvanometer of 20 `Omega` , it gives a full scale deflection. The external resistance need to be connected to measure 5V is
1)98 `Omega` parallel
2)9980 `Omega` parallel
3)98`Omega` series
4)9980`Omega` series

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