# Electromagnetism: Turning effect of coil

## Homework Statement

This is a question about turning effect on a current-carrying coil lying between the poles of a magnet.
Please refer to the following link:
http://img11.picsplace.to/img.php?file=img10/22/N1_000.gif [Broken]
On the textbook, it is stated the turning effect on the coil can be increased by increasing the area of the coil (inside the magetic field).
I understand the force would increase if AB and CD increases.
But I'm not sure whether the turning effect will increase when BC increases. :uhh:
Can anyone tell me?

Thank in advance.

## The Attempt at a Solution

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## Answers and Replies

The force acting on a current-carrying conductor could be calculated with the following formula:

$$F = BIl\sin\alpha$$

where B is magnetic induction, I is current, l is length of the conductor and <alpha> is the angle between the conductor and the magnetic field (the vector B). The angle between the conductor BC and the magnetic field is 0<pi> - the answer is thus apparent.

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