KCET 2010 Physics Solved Paper

An electron enters the space between the plates of a charged capacitor as shown. The charge density on the plate is σ. Electric intensity in the space between the plates is E. A uniform magnetic field B also exists in that space perpendicular to the direction of E.
The electron moves perpendicular to both

→

E

and

→

B

without any change in direction.
The time taken by the electron to travel a distance l in that space is