Two conducting spheres are mounted on insulating rods. They both carry some init

Question

Two conducting spheres are mounted on insulating rods. They both carry some initial electric charge, and are far from any other charge. Their charges are measured. Then, the spheres are allowed to briefly touch, and the charge in one of them (sphere A) is measured again. These are the measured values:

Question # 1

Before contact:
Sphere A = 4.8 nC
Sphere B = 0 nC

What is the charge on sphere B after contact, in nC?

Question # 2

Before contact:
Sphere A = 2.9 nC
Sphere B = -4.4 nC

What is the charge on sphere B after contact, in nC?

Explanation / Answer

The charge becomes divided when both the spheres gets connected ad removed

Charge after being touched

Q = q1 + q2 / 2 = (4.8 + 0) / 2

= 2.4 nC

#2

Q = 2.9 - 4.4 / 2 = -0.75 nC

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