The Tevatron accelerator at Fermilab (Illinois) is designed to carry an 11 mA beam of protons traveling at very nearly the speed of light (300,000,000 m/s) around a ring 6300 m in circumference. How many protons are stored in the beam

The number  is  

Explanation:

From then question we are told that

   The current carried is

    The speed is

    The circumference is

Mathematically current is expressed as

                  where Q is the quantity of charge passing through a conductor and t is the time in seconds

 The time t can be mathematically represented as

Substituting this into the equation fro current

Now making the quantity of charge the subject of the formula

Generally the number of proton in the beam is mathematically represented as  

Where n is the charge on one proton with a value of

Now substituting for q in the equation for N

Substituting values

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scientific laws are the result of testing theories and proving them to be facts.