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The electric field in a region is given by i ˆ ) B Ax ( E + = → , where E is in NC –1 and x is in metres. The value of constants are A = 20 SI unit and B = 10 SI unit. If the potential at x =1 is V 1 and that at x = –5 is V 2 , then V 1 – V 2 is

1. –520 V
2. 180 V
3. –48 V
4. 320 V

Correct answer: 180 V

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