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Two circular rings A and B each of radiu...

Two circular rings A and B each of radius `a=30cm` are placed co-axially with their axes horizontal in a uniform electric field `E=10^(5)N//C` directed vertically upward as shown in the figure. The distance between the centers of these rings A and B is `h=40cm`. Ring A has a positive charge `q_(1)=10muC` while ring B has a negative charge of magnitude `q_(2)=20muC`. A particle of mass m = 100 gm and carrying a positive charge `q=10muC` is released from rest at the centre of the ring A. Calculate its velocity when it has moved a distance 40 cm.

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The correct Answer is:
`6sqrt(2) ms^(-1)`
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