If a wire is stretched to make it 0.1% longer, its resistance will
increase by 0.05%
increase by 0.2%
decrease by 0.2%
decrease by 0.05%
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A potentiometer wire of length 10 m is connected in series with a battery. The e.m.f. of a cell balances against 250 cm length of wire. If length of potentiometer wire is increased by 1 m, the new balancing length of wire will be