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Electric field is the electrostatic forc...

Electric field is the electrostatic force per unit charge acting on a vanishingly small test charge placed at that point. It is a vector quantity and the electric field inside a charged conductor is zero. Electric flux `phi` is the total number of electric lines of force passing through a surface in a direction normal to the surface when the surface is placed inside the electric field.
`phi=ointvecE.vec(ds)=q/epsilon_0`
A positive charge Q is uniformly distributed along the circular ring of radius R. A small test charge q is placed at the centre of te ring as shown.

A

(A) If q`gt`0 and is displaced away from the centre in the plane of the ring, it will be pushed back towards the centre.

B

(B) If q`lt`0 and is displaced away from the centre in the plane of the ring, it will never return to the centre and will continue moving till it hits the ring.

C

(C) If q`lt`0 it will perform SHM for small displacement along the axis.

D

(D) All of the above.

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