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- Thread starter tabitha2232
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(I think you cannot use Ampere's law here (since the length is only 13.3cm, if you use Ampere's law you assume the lenght is nearly infinite).)

The expression for B will be in terms of the current, the length, the radius, the permeability and the number of turns. Solve for the number of turns, and you can plug in your values.

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Do you know Ampere's law?

Do you know Biot-Savart's law?

Do you know which one you must use here?

You could use Ampere's law, which makes the calculation lots easier, but it will also be much more of an approximation.

If you use Biot-Savart's law the magnetic field is more exact. I don't know how much the answer will vary depending on which method you use, it could well be that it is the same (since you will also have to round it to an integer, having 31.53 coils for example doesn't make sense..)

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