mahima pareek
Last Activity: 6 Years ago
The magnetic field here is parallel to the velocity and hence no effect on it .
By. F(B) = q [ v ⅹ B]
So Electric force will affect its velocity
F(E) = qE
So acceleration = qE/m
By first equation of motion
i. e . v = u +a*t
2v = v + qE/m*t
t = mv/qE is the answer
Approve if correct