two identical conducting spheres, now mounted on insulating rods. The two conduc

Question

two identical conducting spheres, now mounted on insulating rods. The two conducting spheres are initially uncharged. A charged rod is brought near them as shown. Then, one of the two spheres is displaced momentarily so that the two spheres touch briefly. After this, one sphere is found to have a net charge of nC. 4.

What is the charge in the second sphere, in nC? . if one sphere is found to have a net charge of 4.7 nC...

Which of the two spheres in the figure carries the positive charge?

A

B

A

B

Explanation / Answer

both sphere were uncharged initially

so total charge on this 2 sphere system is equal to zero and charge is always conserved.

finally one sphere have 4.7 nC, so other sphere will charge q such that total charge of system remain unchanged(say zero)

so 4.7 + q = 0

So, charge, q = - 4.7 nC

Sphere B carries the positive charge.

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