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Assume that an electric field `vec(E) = 30 x^(2) hat(i)` exists in space. Then the potential differences `V_(A) - V_(0)` where `V_(0)` is the potential at the origin and `V_(A)`, the potential at `x = 2m` isA. `-80 J`B. `80 J`C. `120 J`D. `-120 J` |
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Answer» Correct Answer - A Given unit in options is wrong. By using `dv=-vec(E).vec(dx)` `DV=-int vec(E).vec(dx)` `V_(A)-V_(0)=-underset(x=0)overset(x=2)(int)30x^(2)dx=-10x^(3)|_(x=0)^(x=2)` `V_(A)-V_(0)=-10[8-0]=-80 V` |
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