A $2\, volt$ battery, a $15\,\Omega $ resistor and a potentiometer of $100\, cm$ length, all are connected in series. If the resistance of potentiometer wire is $5\,\Omega $, then the potential gradient of the potentiometer wire is ............... $V/cm$
AIIMS 1982, Medium
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Potential gradient $ = \frac{e}{{(R + {R_h} + r)}}.\frac{R}{L}$
$ = \frac{2}{{(15 + 5 + 0)}} \times \frac{5}{1}$$ = 0.5\frac{V}{m} = 0.005\,\frac{V}{{cm}}$
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