Fri September 23, 2011 By:

A potentiometer wire carries a steady current. The potential diff. across 70cm length of it balances the potential diff. across a 2 ohm coil supplied by a cell of emf 2V and unknown int. resistance r, When 1 ohm resistance is placed in parallel with a 2 ohm, a length equal to 50 cm of the potentiometer wire is required to balance the potential diff. across the parallel combination. Find r.

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Tue October 04, 2011
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