SPEAR is a storage ring at the Stanford Linear Accelerator which has a circulating beam of electrons that are moving at nearly the speed of light (2.998 108 m/s). If a similar ring is about 68.0 m in diameter and has a 0.37 A beam, how many electrons are in the beam

The no. of electron in the beam =

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 .

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it is a negative acceleration