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Assume that an electric field i ˆ x 30 E 2 = r exists in space. Then the potential difference V A – V O , where V O is the potential at the original and V A the potential at x = 2 m is -

1. –120 J
2. – 80 J
3. 80 J
4. 120 J

Correct answer: – 80 J

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