The figure shows an insulating ring and an infinitestraight wire resting on the

Question

The figure shows an insulating ring and an infinitestraight wire resting on the surface of an infinite plane. The wireis fixed in position, but the ring slides without friction on thesurface of the plane. The ring is uniformly charged, with netpositive charge Q. Initially, the wire carries a constant current Itowards the top of the figure, and the ring is stationary. At timet=0, the current in the wire is reduced to I/2. Which of thefollowing best describes the motion of the ring after the currentis reduced? and Why?

1. The ring will spin clockwise and slide away from thewire.

2. The ring will spin clockwise and slide towards thewire.

3. The ring will spin clockwise and remainstationary.

4. The ring will not spin, but it will slide towards thewire.

5. The ring will spin counterclockwise and slide towardsthe wire.

6. The ring will spin counterclockwise and remainstationary.

7. The ring will not spin, but it will slide away fromthe wire.

8. The ring will spin clockwise and slide towards thetop of the figure.

9. The ring will spin counterclockwise and slide towardsthe top of the figure.

10. The ring will not spin, but it will slide towardsthe bottom of the figure.

11. None of the above (please describe whatdoes happen).

Hint: Think of the induced electric fields. If they canmake current move, they can also apply a force or torque to acharge on an insulator.

Explanation / Answer

can any one help, plz?

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