The galvanometer records a current , Physics

A galvanometer together with an unknown resistance in series is linked across two identical batteries each of 1.5V. whenthese batteries are connected in series the galvanometer records a current of 1A and when the batteries are in parallel the current is 0.6A. The internal resistance of battery will be ?

Ans) R(net) in first case= R+2r



R(net) in Second case= R + r/2



=> 5=2R+r..............eq(2)

Solving eq1 and eq2

we get r= 1/3 or .33 ohms. 



Posted Date: 4/5/2013 1:47:39 AM | Location : United States

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