Question: A circular wire of diameter D lies on a horizontal table and carries a current I. In Fig. point A marks the center of the

A circular wire of diameter D lies on a horizontal table and carries a current I. In Fig. point A marks the center of the circle and point C is on its rim.
(a) Find the magnitude and direction of the magnetic field at point A.
(b) The wire is now unwrapped so it is straight, centered on point C, and perpendicular to the line AC, but the same current is maintained in it. Now find the magnetic field at point A.
(c) Which field is greater: the one in part (a) or in part (b)? By what factor? Why is this result physically reasonable?

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