An electron of kinetic energy 10 keV moves perpendicular to the direction of a uniform magnetic field of 0.8 milli tesla. Calculate the time period of rotation of the electron in the magnetic field.

Explanation

To solve the problem of calculating the time period of rotation of an electron moving perpendicular to a magnetic field, we can follow these steps:

### Step 1: Understand the Given Information
- Kinetic Energy (KE) of the electron = 10 keV
- Magnetic Field (B) = 0.8 milliTesla = 0.8 x 10^-3 Tesla

### Step 2: Convert Kinetic Energy to Joules
The kinetic energy in joules can be calculated using the conversion:
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