An electron enters a chamber in which a uniform magnetic field is present as shown

An electric field of appropriate magnitude is also applied so that the electron travels undeviated without any change in its speed thorugh the chamber. We are ignoring gravity. Then, the direction of the electric field is

Options

A. opposite to the direction of the magnetic field
B. opposite to the direction of the electrons motion
C. normal to the plane of the paper and coming out of the plane of the paper
D. normal to the plane of the paper and into the plane of the paper

Answer

D

Explanation

`qvecE + q(vecV xx vecB)= 0 `
Hence, into the paper