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Question

Two copper balls, each weighing 10g are kept in air 10 cm apart. If one electron from every 106 atoms is transferred from one ball to the other, the coulomb force between them is (atomic weight of copper is 63.5)


Your Answer
A
2.0×1010N
 
Your Answer
B
2.0×104N
 
Correct Answer
C
2.0×108N
 
Your Answer
D
2.0×106N

Solution

The correct option is C 2.0×108N
 
Number of atoms in given mass =1063.5×6.02×1023
=9.48×1022

Transfer of electron between balls =9.48×1022106
=9.48×1016
Hence magnitude of charge gained by each ball.
Q=9.48×1016×1.6×1019=0.015C
Force of attraction between the balls
F=9×109×(0.015)2(0.1)2=2×108N.

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