A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If the electric field strength is 2.2 x 104 N/C, what should be the value of the magnetic field (in tesla) to select protons of velocity 6.4 x 105 m/s

The value is  

Explanation:

From the question we are told that

  The electric field strength is  

   The velocity is  

Generally the magnetic field is mathematically represented as

=>    

=>    

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