Question

An electron with charge e and mass m travels at a speed v in a plane perpendicular to magnetic field of magnitude B the electron follow a cicular path of radius R in a time t what is the amount of work done by the magnetic field
​

Answer 1

Answer ⤵️

Radius of path is given by r=

Bq

mv

Here, m and q remain unchanged

So,

r

2

r

1

=

V

2

v

1

⋅

B

1

B

2

=

2v

v

⋅

B

B/2

=

4

1

⇒r

2

=4r