Physics-
General
Easy
Question
In the figure shown, if 
is equal to
- 30cm
- 40cm
- 34cm
- 60cm
The correct answer is: 40cm
Here we have 
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In frame I, two identical conducting spheres, A and B, carry equal amounts of excess charge that have the same sign. The spheres are separated by a distance d; and sphere A exerts an electrostatic force on sphere B which has a magnitude F. A third sphere, C, which is handled only by an insulated rod, is introduced in frame II. Sphere C is identical to A and B except that it is initially uncharged. Sphere C is touched first to sphere A, in frame II, and then to sphere B, in frame III, and is finally removed in frame IV.
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Determine the magnitude of the electrostatic force that sphere A exerts on sphere B in frame IV
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