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A single current-carrying circular loop of radius R is placed at a distance R/2 from a long, straight wire, as shown in
the figure. A current of I = 950 mA flows to the right in the wire.
R
R/2
I
(a) What current must flow in the loop to produce a net magnetic field of zero at its center?
(b) If the current in the loop is 950 mA clockwise, the magnitude of the net magnetic field at the center of the loop is
3.0 µT. Find R.

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