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Q.

In an experiment three microscopic latex spheres are sprayed into a chamber and became charged with charges +3e, +5e and −3e respectively. All the three spheres came in contact simultaneously for a moment and got separated. Which one of the following are possible values for the final charge on the spheres?

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a

-4e, +3.5e, +5.5e

b

+5e, -4e, +5e

c

+5e, +6e, -7e

d

+5e, -8e, +7e

answer is B.

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Detailed Solution

Total charge of all spheres before making contact $= + 3 e + 5 e - 3 e = + 5 e$
So as per conservation of charge, total charge of all spheres after making contact should be +5 e as well which is possible only in option (b).
Therefore, total charge $= + 6 e + 6 e - 7 e - (+ 5 e) = 0$

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