A Flat Circular Coil Having 57 Turns of Very Thin $\vec { B }$

A flat circular coil having 57 turns of very thin wire has a diameter of 9.5 cm and carries 7.2 A of current.(μ₀ = 4π × 10^-7 T ∙ m/A)
(a)What is the magnitude of the $\vec { B }$ field at the center of the coil?
(b)If the same length of wire were used to make a coil with twice the original diameter,how large would the $\vec { B }$ field at the center be when it carried the same current as before?

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(a)5.4 mT ...

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