A particle having a charge`20mu C` and mass `20mug` moves along a circle of radius 5.0 cm under the action of a magnetic field B = 1.0 T. When the particle is at a point P, a uniform electric field is switched on and it is found that the particle continues on the tangent through P with a uniform velocity. Find the electric field.

Explanation

To solve the problem step by step, we will follow the principles of motion in magnetic and electric fields.

### Step 1: Understand the forces acting on the particle
The particle is moving in a circular path due to the magnetic force, and when the electric field is applied, it continues to move tangentially. This implies that the magnetic force acting on the particle is equal to the electric force when the electric field is switched on.

### Step 2: Write the expressions for the forces
The magnetic force \( F_m \) acting on a charged particle moving in a magnetic field is given by:
\[
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