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A small sphere of charge q 1 = 0.872 C hangs from the end of a spring as in Figu

ID: 2125872 • Letter: A

Question

A small sphere of charge q1 = 0.872 C hangs from the end of a spring as in Figure a. When another small sphere of charge q2 = -0.624 C is held beneath the first sphere as in Figure b, the spring stretches by d = 3.75 cm from its original length and reaches a new equilibrium position with a separation between the charges of r = 4.70 cm. What is the force constant of the spring?
N/m

A small sphere of charge q1 = 0.872 mu C hangs from the end of a spring as in Figure a. When another small sphere of charge q2 = -0.624 mu C is held beneath the first sphere as in Figure b, the spring stretches by d = 3.75 cm from its original length and reaches a new equilibrium position with a separation between the charges of r = 4.70 cm. What is the force constant of the spring?

Explanation / Answer

kd = k q1 q2/r^2

k = (9E9*0.872e-6*0.624E-6/4.7E-2^2)/3.75E-2=59.12

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