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Total potential difference across potentiometer wire is 10⁻³ × 400 volt = 0.4 volt. Potential gradient = 1 mV/cm = 10⁻³ V/cm = 10⁻¹ V/m.

1. Potential gradient = 10⁻³ V/cm
2. Potential gradient = 10⁻² V/cm
3. Potential gradient = 10⁻¹ V/cm
4. Potential gradient = 10⁻⁴ V/cm

Correct answer: Potential gradient = 10⁻³ V/cm

Solution

The potential gradient is given as 1 mV/cm, which is equivalent to 10⁻³ V/cm. This matches option A.

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