1You have posted this question twice :D
refer my doubts on this one in that question
and pls answer
a battery with external resistance R with galvanometer in series are connected to form a circuit Across the galvanometer another external resistance 40ohm is connected in parallel through an open key K if key K is pressed then galvanometer reading becomes half the resistance of galvanometer is a)20ohm b)30ohm c)40ohm 50ohm
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