28- Two charged insulating spheres of radiusR- are kept at a distance -d- -d- 2R- Onehas a charge - q and the other-q- The forcebetween them will be-221 q-B-0 d2-D- None of these4- 29-Two charged conducting spheres of radius-R- are kept at a distance -d-d - 2R- One has a charge - q and theother -q- The force between them will be-2-B- Ao 2-D- None of these4- o d4- 02

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Four Fundamental Forces

28. Two charg...

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28. Two charged insulating spheres of radiusR' are kept at a distance 'd' (d> 2R). Onehas a charge + q and the other-q. The forcebetween them will be:221 q(B):0 d2(D) None of these4πε 29.Two charged conducting spheres of radius"R' are kept at a distance 'd(d > 2R). One has a charge + q and theother +q. The force between them will be:2(B) Ao 2(D) None of these4τε o d4πε 02

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