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If vec(j) and vec(E ) are current and el...

If `vec(j)` and `vec(E )` are current and electric field inside a current carrying conductor at an instant then `vec(j). Vec( E )` is
(1) Positive (2) Negative
(3) Zero (4) May be positive or negative

Text Solution

Verified by Experts

Current density `vec(j)` is directed along `vec(E)` . So the angle between `vec(j)` and `vec(E)` is `0^(@)` .
`therefore vec(j) vec(E) = j E cos 0^(@) = jE` i.e., positive
So, the option (1) is correct .
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