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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.
- 10 V
- 90 V
- 1000 V
- 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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