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NEET 2001 (AIPMT) · Potentiometer

Potentiometer question from NEET 2001 (AIPMT)

Q88NEET 2001 · AIPMTEasy

Potentiometer

If specific resistance of a potentiometer wire is 10-7Ω\Omega m and current flow through it is 0.1 amp., cross-sectional area of wire is 10−-6 m2 then potential gradient will be

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Answer: (a)

  1. k=VL=IRL=IρAk = \frac{V}{L} = \frac{IR}{L} = \frac{I\rho}{A}.
  2. k=0.1×10−710−6=10−2 V/mk = \frac{0.1 \times 10^{-7}}{10^{-6}} = 10^{-2}\ \text{V/m}.
  3. So the answer is (a) 10−210^{-2} volt/m.
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