Balance point in the middle of the bridge wire

Question

Why it is necessary to obtain the balance point in the middle of the bridge wire?

 

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Physics Sudhanshu Kumar 10 months 1 Answer 178 views 0

Answer ( 1 )

  1. The sensitivity of the Wheatstone’s bridge is maximum when the resistance of all its four arms are nearly of the same order. For this, the null point or the balance point should be near the middle of the wire.

    Also, when the balance point is in the middle of the wire, a small error in determining its position introduces the least error in the value of unknown resistance i.e. the accuracy of the result is the highest.

     

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