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Q.

Two electrons separated by distance ‘r’ experience a force F between them. The force between a proton and a singly ionized helium atom separated by distance 2r is

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a

F/4

b

F/2

c

2F

d

4F

answer is D.

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Detailed Solution

Singly ionized helium will have a charge equal to +e

So, F2F1=r12r22⇒F2F=r24r2⇒F2=F4

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