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## Homework Statement

A toroid has a 49.4-cm inner diameter and a 57.4-cm outer diameter. It carries a 23 A current in its 500 coils. Determine the range of values for

*B*inside the toroid.

A) Bmaximum = ?

B) Bminimum = ?

## Homework Equations

B = mu0/2pi * NI/r[/B]

## The Attempt at a Solution

I tried plugging in the values from the problem but I am not sure where I am going wrong.

B minimum = Mu0 * 500 * 23 / 2 pi * (.494/2)

B maximum = Mu0 * 500 * 23 / 2 pi * (.572/2)

Am I doing something wrong with the radius? Is the B minimum not thre inner r and the maximum the outer r?