Question

Problem 81

Answer 1

Given information

Given that electrons are accelerated horizontally by 2.2 kV,

ie; Potential energy = 2.2 kV

It is made to pass through a uniform magnetic field B for a distance of 3.8 cm,

ie; d = 3.8 cm

B deflects them upward so they reach the top of a screen 22 cm away,

ie; l = 22 cm

electron is deflected 11 cm above the center

ie; h = 11 cm

We are asked to find the magnetic field.

Step-by-step explanation

Step 1.

First, we have to find the speed of the electrons. For that, we will apply the law of conservation of energy.

The accelerating potential energy will provide the necessary kinetic energy for the electrons.

ie;

 

 

We have 

and      

So,