Two spherical metal shells 1 and 2 with charges Q1 and Q2, respectively, experie

Question

Two spherical metal shells 1 and 2 with charges Q1 and Q2, respectively, experience an attractive force of magnitude F12 when the shells are separated by a distance R as measured from the centers of the shells. (R is larger than the sum of the radii of the shells so they do not touch.) A point charge with charge -Q1 is placed at the center of shell 1 while another point charge with charge -Q2is placed at the center of the shell 2. What is the new force between the shells?

A)F12

B)2F12

C)4F12

D)0

E) None of the above

Please explain thoroughly.

Explanation / Answer

Initial Charge in shell 1 , = Q1
Charge kept at the center of shell = - Q1

Net Charge of shell 1 = Q1 - Q1 = 0

Similarly for shell 2 , Net Charge = 0


New Force btw the shell's = 0

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