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Two fixed insulating rings A and B carry...

Two fixed insulating rings A and B carry charges with uniform linear charge density `+lambda` and `-lambda`, respectively, as shown in the adjacent figure. The planes of the rings are parallel to each other and their axes are coinciding. A particle of change "q" and mass "m" is released with zero velocity from centre P of the positively charged ring. The kinetic energy of the particle when it reaches centre Q of the negatively charge ring will be

A

`sqrt((2lambdaq)/(m in_0)(1-1/sqrt2))`

B

`lambda/in_0 (1-1/sqrt2)q`

C

`lambda/(2in_0)(1-1/sqrt2)q`

D

none of the above

Text Solution

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The correct Answer is:
B
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