NEET2015Physics-Current and electricity
NEET 2015 Physics Potentiometer MCQ Question
Type: MCQ-numerical-Medium-Class 12
A potentiometer wire has length 4 m and resistance 8 Ω. The resistance that must be connected in series with the wire and an accumulator of e.m.f. 2 V, so as to get a potential gradient 1 mV per cm on the wire is
A
32 Ω
B
40 Ω
C
44 Ω
D
48 Ω
Correct Answer
Option D
Detailed Explanation
The total resistance needed to achieve a potential gradient of 1 mV/cm is calculated using the formula for potential gradient, resulting in a series resistance of 44 Ω.
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