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Find current through 4 ohm resistance

An AC current is given by i= 3+4 sinwt ,then its effective value

Find the current through 4Omega resistor in the circuit shown in figure.

When a galvanometer is shunted with a 4 Omega resistance, the deflection is reduced to one-fifth. If the galvanometer is further shunted with a 2 Omega wire, determine current in galvanometer now if initially current in galvanometer is I_(0) (given main current remains same).