An ideal battery of 4V and resistance R are connected in series in the primary circuit of a potentiometer of length 1m and resistance 5 Ω Ω . The value of R, to give a potential difference of 5mV across 10 cm of potentiometer wire, is:
Text Solution
Verified by ExpertsThe correct answer is:
D
Potential gradient k = x = 
⇒ 
⇒ 400 = R + 5
R = 395 Ω Ω .
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