NEET Physics Current Electricity Questions Solved

(a) Write the principle of working of a metro bridge.

(b) In a metre bridge, the balance point is found at a distance l1 with resistances R and S as shown in the figure. 

An unknown resistance X is now connected in parallel to the resistance S and the balance point is found at a distance l2. Obtain a formula for X in terms of l1,l2 and S.                                      (3)

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