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# The electrostatic force on a small sphere of charge 0.4 μC due to another small sphere of charge –0.8 μC in air is 0.2 N. What is the force on the second sphere due to the first?

Q 1.2: The electrostatic force on a small sphere of charge $0.4 \mu C$due to another small sphere of charge $-0.8 \mu C$ in air is $0.2N$.(b)What is the force on the second sphere due to the first?