InterviewSolution
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InterviewSolution
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A chargedmetallic spere A is suspended by a nylon thread another charged metallic spere b heldby an insulating centres is 10 cmc and dare then removed and b is brought closer to a to a what is txpectd repulsionofa on the basis of columb law sphereaandc speres b and dhave indentical sizes ignore the sizes ofa and b in comparision to the separation between theircentres |
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Answer» Solution :Letthe originalcharge on spere a be q and that on b beq at a distance R beteen theircentres the MAGNITUDE of the `F=(1)/(4piepsilon_(0))(QQ)/(r^(2))` neglecting the sizes of sperhers aand b in comparionsto r when an identical but unchanged spere c touches a the chargesredisitribute on a and c and by symmetry each sprere CARRIES a charge `q//2`similary after d touchesb the rredistributedcharge on each isof the electrosatic force on each is `F=(1)/(4pi epsilon_(0))((q//2)(q//2))/(r//2)^(2)=(1)/(4piepsilon_(0))(qq)/(r^(2))=F` Thus the electrostaticforce on a due to b remainsunaltered |
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