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Q.

The force between two electrons when placed in air is equal to 0.5 times the weight of an electron. Find the distance between two electrons (mass of electron= 9.1×10–31kg)

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a

7.2 m

b

72 cm

c

72 m

d

720 m

answer is A.

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Detailed Solution

F=0.5mg=0.5×9.1×10−31×9.8N4.9×9.1×10−31=9×109×1.6×10−19×1.6×10−19r2⇒r2=1.6×10−19×1.6×10−194.9×10−31×109⇒r=0.72×10−19+20=7.2m

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