An electron havin

Given-
Kinetic energy of an electron = 100 eV

Radius of the circle = 10 cm

We now kinetic energy is given by

Where

From question , we can confer that

Here,
m is the mass of an electron

v is the velocity of an electron.

We know that 1 eV = 1.6 × 10⁻¹⁹ J

Thus,

Now, radius r -

Therefore, magnetic field applied is 3.4 × 10⁻⁴ T

Number of revolutions per second of the electron is nothing but the frequency given by ,

From (1)