Answer:
The no. of electron in the beam =

Step-by-step explanation:
Given :
The diameter of circular ring = 68 m.
The current flowing in the beam = 0.37 A
Speed of light =

We know that the current is equal to the charge per unit time.
⇒

∴

Here given in the question, electron revolving in a circle with the diameter
m
⇒ Time take to complete one round

∴



Now, for finding the no. of electron we have to divide
to the charge of the electron

∴
=


Thus, the no. of electron in the beam is
.