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Question

Two charged particles placed at a separation of 20 cm exert 20 N of Coulomb force on each other. What will be the force of the separation is increased to 25 cm?

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Solution

Two charged particles placed at a separation of 20 cm exert 20 N of Coulomb force on each other.
So, F1=14π0·q2r12
Also, F2=14π0·q2r22
According to the question, we have:
F2F1=r12r22 =20×2025×25=1625F2=1625×F1
F2=1625×20 F2=12.8 N 13.0 N

Therefore, the two charged particles will exert a force of 13.0 N on each other, if the separation is increased to 25 cm.

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