Ex. 55 A potential drop per unit length of wire is 5 x 10° V/m. If the e.m.f. of the cell balances against a length of 216 cm of the potentiometer wire. Find the e.m.f. of the cell.
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A: Solution:-Given thatcharge to be decreased by 80%C=0.02 μF=0.02×10-6 FR=344 Ω
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