Question

Two-point charges of 6uC and 9uC separated
by 10 cm repel each other with some force F.
If a charge of - 4uC is added with each of
them, then the force between them is 20 N.
Calculate the initial force exists between
them before adding the charge.​

Answer 1

Answer:

Explanation:

Answer:  

The new force is attractive in nature as the charges are in opposite sign and the magnitude of the new force is .

Solution:

The old charges are +2μC and +6μC. If an additional charge of -4μC is added in that then the new charges will be -2μC and 2μC respectively.

The force between the two old point charges is 12N. As they both are positive charges, they repel each other. So the distance between the two charges can be found from coulomb’s law.

The distance found can be used in the force between the new charges -2μC and 2μC.

So, the new force is attractive in nature as the charges are in opposite sign and the magnitude of the new force is

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