Two identical conducting balls have positive charges `q_(1)!= q_(2)` respectively . The balls are brought together so that they touch and then put back in their original positions . The force between the ball is :

Options

A. The same as it was before the balls touched .
B. Greater than before the balls touched .
C. Less than before balls touched .
D. Zero

Answer

B

Explanation

The force between charges `q_(1) & q_(2)` before contact
`(F) = (q_(1)q_(2))/(4piepsilon_(0)r^(2))`
If these two charges are in kept , and then seperated , charges on each are `(q_(1)+q_(2))/2 = q `
After contact , `F = 1/(4piepsilon_(0)r^(2)) ((q_(1)+q_(2))/2)^(2)`
` :. " " ((q_(1)+q_(2))/2) xx ((q_(1)+q_(2))/2) gt q_(1)q_(2)`
` :. F gt F `