1.

Electric field given by the vector E = x hat(i) + y hat (i) is present in the XY plane. A small ring carrying charge +Q. which can freely slide on a smooth non conducting rod, is projected along the rod from the point (O,L) such that it cann reach the other end of the rod which is a at (I,O). What minimum velocity should be given to the ring ? (Assume zero gravity)

Answer»

`(QL^(2)//m)^(1//2)`
`2(QL^(2)//m)^(1//2)`
`4(QL^(2)//m)^(1//2)`
`((2QL^(2))/(m))^(1//2)`

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