Question

A uniform magnetic field acts at right angles to the direction of motion of an electron. As a result, the electron moves in a circular
path of radius 2 m. If the speed of the electron is doubled, then the radius of its circular path (in m) is​

Answer 1

Answer:

The radius of the electron moving in a magnetic field is given by:

r=

qB

mv

⇒r∝v,

So, when the speed of the electron is doubled, the radius will also be doubled for the electron.

⇒r

2

=2r

1

=2×2=4 cm