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Question

A positive charge +Q is fixed at a point A. Another positively charged particle of mass m and charge +q is projected from a point B with velocity u as shown in the figure. The point B is at a large distance from A and at a large distance d from the line AC. The initial velocity is parallel to the line AC. The point C is at very large distance from A. Find the minimum distance (in meter) of +q from + Q during the motion. [Take Qq=4πϵ0mu2d]

A
d(1+2)
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B
d(21)
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C
d(1+2)
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D
d(21)
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Solution

The correct option is A d(1+2)
Mass =m
Charge =q
The point B is at a charge distance from A and at a large distance d from the line AC
the minimum distance =d(1+2)
q=(1+2)
New distance =d(1+2).

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