The Radius of a Coil of Wire with N Turns

question 9

Multiple Choice

The radius of a coil of wire with N turns is r = 0.28 m. A clockwise current of I_coil = 1.0 A flows in the coil, as shown. A long, straight wire carrying a current I_wire = 29 A toward the left is located 0.04 m from the edge of the coil. The magnetic field at the center of the coil is zero tesla. Determine N, the number of turns.

• A)8
• B)2
• C)6
• D)4

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