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  4. An ideal battery of emf 2 V and a series resistance R are connected in the primary circuit of a potentiometer of length 1 m and resistance 5 Ω . The value of R , to give a potential difference of 5 mV across 10 cm of potentiometer wire is

Q. An ideal battery of emf and a series resistance are connected in the primary circuit of a potentiometer of length and resistance . The value of , to give a potential difference of across of potentiometer wire is

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Solution:


Therefore, the potential difference across the potentiometer wire of lengths L = 100 cm is

Given, for 10 cm of wire. Hence, we have

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