An electron beam passes through crossed electric and magnetic fields of `3.4xx10^(4) Vm^(-1)` and `2xx10^(-3)Wbm^(-2)` respectively. If the path of the beam remains undeviated, calculate the speed of the electrons . If the electric field is removed, what will be the radius of the circular path described by the electrons ?

Explanation

To solve the problem step by step, we will first calculate the speed of the electrons when they pass through crossed electric and magnetic fields without deviation. Then, we will find the radius of the circular path when the electric field is removed.

### Step 1: Understanding the Forces Acting on the Electron
When the electron beam passes through the crossed electric field (E) and magnetic field (B) without deviation, the electric force (F_e) acting on the electrons must equal the magnetic force (F_m) acting on them.

### Step 2: Write the Expressions for Electric and Magnetic Forces
The electric force acting on an electron is given by:
\[ F_e = qE \]
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