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A charge of 3 C feels a force of 300 N in a uniform electric field. Find the potential difference between two points 10 cm apart measured along the field direction.

1. 10 V
2. 90 V
3. 1000 V
4. 9000 V

Correct answer: 10 V

Solution

The field is E = F/q = 300/3 = 100 V/m (= N/C). For a uniform field the potential difference over a displacement d along the field is V = E*d = 100 * 0.10 = 10 V.

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