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What is end error in a metre bridge ? Ho...

What is end error in a metre bridge ? How is it overcome ? The resistances in the two arms of the metre bridge are R=5`Omega` and S respectively. When the resistance S is shunted with an equal resistance, the new balance length found to be `1.5l_1`, where `l_1` is the initial balancing length. Calculate the value of S.

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