http://tinypic.com/r/okvimd/7 <---------- questions based on this illustration.

Question

http://tinypic.com/r/okvimd/7 <---------- questions based on this illustration.

The illustration above shows a current carrying wire between magnetic poles. the arrows in the picture show the direction of the current.

30A) In the illustration above, will side x be forced up turning out of the page, or down, turning into the page?

30B) How far will the wire rotate before it stops? why?


30C) how could you cause the wire in the illustration to continue to rotate after it stops?


30D) what is the name of the machine indicated in part C, in which a current- carrying wire rotates continuously in a magnetic field? what is the purpose of this machine?

Thanks for your time

Explanation / Answer

A) The magnetic field points in the direction of the south pole. The force on the wire is given by F=iLxB. The right hand rule gives the direction of the force, since the current is downward crossed with a magnetic field going to the right, the force is out of the page. The wire will turn out of the page. B) The wire will rotate upwards, accelerating, until it reaches the top. Then, its rotational velocity will keep it turning, but the force will still be upwards so now it will accelerate in the opposite direction of its initial motion. Eventually, it will stop when it is at the top (furthest out of the page as possible). C) The wire would continue to rotate if you changed the direction of the current, or if you changed the directtion of the magnetic field. (Based on the next question, I think the answer they are looking for is changing the direction of the current, or an alternating current.) D) Alternating-current electric motor. It is used to create energy by powering a generator.

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