Magnetic Field of a Current Loop: A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the figure. The current I in the wire flows to the right. In which direction must current flow in the loop to produce a net magnetic field of zero at its center?
A. counterclockwise
B. clockwise
C. It could be either clockwise or counterclockwise.
D. The current in the loop should be zero.
Answer: B
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