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(electricity) If the coils are pressed together then the electromagnentic field at the...

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t4trendesetter | Honors

Posted July 3, 2013 at 5:40 AM via web

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(electricity)

If the coils are pressed together then the electromagnentic field at the poles will(A)be strenghted (b)be weakend (c)stay the same

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ishpiro | Teacher | (Level 1) Associate Educator

Posted July 3, 2013 at 12:54 PM (Answer #1)

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The assumption in this answer is that the loops of the wire are in the plane perpendicular to the magnet.

(A) The field will be strengthened

This coiled wire forms a solenoid, which creates magnetic field approximately equal to

`B = mu*n*I` , where `mu` is a constant, n is the density of the loops and I is the electiric current in the wire.

If the coils are pressed together, the denisty of the loops increases while the current stays the same. Therefore, the magnetic field created by the coiled wire increases and the magnetic field at the poles of the magnet increases as well.

 

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