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A jumper of mass m and length l is place...

A jumper of mass m and length l is placed on two prabolic rails in x-y plane. Shape of the rails can be described by Rail 1:y=`x^2` (and z=0) Rail 2:y=`x^2` (and z=l) If x is horizontal and y is vertical direction and magnetic field in the space is `B_0hatj`, the jumper can remain in equilibrium when y coordinate of its ends (i=current in jumper)

A

`(iB_0l)/(2mg)`

B

`(iB_0l)/(mg)`

C

`((iB_0l)/(mg))^2`

D

`((iB_0l)/(2mg))^2`

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