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1)

Two large vertical and parallel metal plates having a  separation of 1 cm are connected to a DC voltage source of potential difference  X. A proton is released at rest midway between the two plates. It is found to move at 450 to the vertical just after release. Then X is nearly


A) 1×105V

B) 1×107V

C) 1×109V

D) 1×1010V

Answer:

Option C

Explanation:

 24112021709_m10.PNG

 

net force  is at 450  from vertical

   qE=mg

or   qXd=mg      (E=Xd)

 or      X=mgdq

  =  (1.67×1027)(9.8)(102)(1.6×1019)

    =1×109V