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Q. The speaker coil consists of 100 turns of wire, 2.0 cm in diameter. The current in the speaker will be 1.6 A when the force on the speaker coil is 14.8 N. What strength magnetic field will give this force?

Q. Two long, parallel conductors carry currents I1 = 2.50 A and I2 = 3.50 A, both directed into the plane of the computer screen. Determine the magnitude and direction of the resultant magnetic field at P.

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