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A potentiometer wire is 10 m long with resistance 10 ohm, connected to a battery of EMF 11 V and internal resistance 1 ohm. Find the potential gradient along the wire.

1. 10 V/m
2. 1 V/m
3. 0.1 V/m
4. none

Correct answer: 1 V/m

Solution

Current = 11/(10+1) = 1 A; voltage across the 10 ohm wire = 10 V; gradient = 10 V / 10 m = 1 V/m.

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