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Q.

A, B, C are three identical uncharged metel sheets. A is charged positively, B is charged negatively and C is uncharged. If mAmBmC   are masses of sheets after charging, correct statement is

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a

mA>mC>mB

b

mA<mC<mB

c

mA=mB=mC

d

mA>mB>mC

answer is D.

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Detailed Solution

Plate A : loss of electrons get + ve charged (slightly decrease mass)

Plate B : Excess of electrons get – ve charged (slightly increase mass)

Plate C : Equal number of ‘-ve’ charges and + ve charges so it is neutral

[mC  is slightly greater than plate A slightly less than plate B]

i.e mA<mC<mB

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