Question

7. An electron enters a magnetic field whose direction is perpendicular to the velocity of the electron.

Then

(1) The speed of the electron will increase

(2) The speed of the electron will decrease

(3) The speed of the electron will remain the same

(4)The velocity of the electron will remain the same

Answer 1

the answer is option 2 as they are perpendicular.

Answer 2

I thought that it will be option 2