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There exists a uniform cylindrically sym...

There exists a uniform cylindrically symmetric magnetic field directed along the axis of a cylinder but varying with time as B=kt. If an electron is released from rest in this field at a distance of 'r' from the axis of cylinder, its acceleration, just after it is released would be (e and m are the electronic charge and mass respectively)

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The correct Answer is:
`(erk)/(2m)` directed along tangent to the circle of radius `r`, whose centre lies on the axis of cylinder.
`ointvec(E).vec(dl)=d/(dt)vec(B).vec(A) impliesE.2pir=pir^(2)d/(dt)kt impliesE=(rk)/2`
`a=(eE)/m implies a=(erk)/(2m)`
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