A small sphere of charge q1 = 0.816 µC hangs from the end of a spring as in figure a. When another small sphere of charge  q2 = −0.636 µC  is held beneath the first sphere as in figure b, the spring stretches by d = 3.72 cm from its original length and reaches a new equilibrium position with a separation between the charges of r = 5.15 cm. What is the force constant of the spring?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.