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Two long coaxial solenoids of radius R and 2R have equal number of turns per unit length. They carry time-varying currents. `i_(1) = 2 kt and i_(2) = kt` respectively, in the same direction. A point charge released between the solenoids at a distance r, is seen to move along a circular path. Then the value of r is

A

`r = Rsqrt(2)`

B

`r = 3R//2`

C

`r = Rsqrt(3)`

D

It can be any value between `R and 2 R`

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The correct Answer is:
A
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