Calculate the electrostatic force between a -540 µC charge and a -579 µC charge

Question

Calculate the electrostatic force between a -540 µC charge and a -579 µC charge that are 69 mm apart.


N

Is the force between the charges attractive or repulsive? Why? Choose one of the answers below.
The force is attractive because they have the same sign.
The force is repulsive because charges are always repelled from each other.
The force is repulsive because they have opposite signs.
The force is repulsive because they have the same sign.
The force is attractive because they have opposite signs.
The force is attractive because charges are always attracted to each other.

Explanation / Answer

force = k|q1|*|q2|/r^2 |q1| = 540 x 10^-6 C |q2| = 579 x 10^-6 C r = .069 m k = 9 x 10^9 F = 591039.7 N as the charges are of same sign force between them is repulsive. The force is repulsive because they have the same sign

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