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Question

Three identical cells are connected across potentiometer as shown in figure. When switch S is open, null deflection length of potentiometer wire is 250 cm and when S is closed it is 200 cm. Then internal resistance of each cell is(up to two decimal places)

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Solution

When S is open (VABLAB)×250=+VABLAB=250(1)
When S is closed 3ir=2i=VABLAB×200(2)
3ir=250×2005=3ir

15ir=(2+3r)i12r=2r=16=0.17Ω

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