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A uniform electric field of strength E e...

A uniform electric field of strength E exists in region. A electron enters a point A with velocity v as shown. It moves through the electric field and reaches at point B. Velocity particle at B is `2v` at `30^@` with x-axis .
Then

A

Electric field `vec(E) = - (3mv^(2))/(2 e a) hat(i)`

B

Rate of doing work done by electric field at B is `(3mv^(2))/(2 ea)`

C

Both (A) and (B) are correct

D

Both (A) and (B) are wrong

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