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pallavi pradeep bhardwaj Grade: 12
        

The excess of electron that must be placed on each of two small spheres spaced 3 cm apart if the force of repulsion between the spheres is to be 10^-19 N is

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear pallavi


let the charge on spheres is q


so F= 1/4∏ε qq/.032


  given F= 10-19


       1/4∏ε qq/.032 =10-19


 9 *109 * q2 /.032 =10-19 


               q=10-16


1 electron has  1.6 * 10-19 C  


 ne =q


 n=q/e =10-16/1.6 * 10-19 C


           =625


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7 years ago
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