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Uniform electric field of magnitude `100 Vm^-1` in space is directed along the line `y = 3 + x`. Find the potential difference between points `A (3,1) and B (1,3)`.A. ` 100 V`B. ` 200 sqrt 2 V`C. ` 200 V`D. ` 0`

Answer» Correct Answer - D
` vec E = 100 cos 45^@ hat I + 100 sin 45^@ hat i`
` vec E= 50 sqrt 2 hat I + 50 sqrt 2 hat j`
` d vec r =- 2 hat I + 2 hat j`
` dV =- vec E. dvec r`
` dV=0`


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