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Standard VII

Physics

Electric Bell

The voice coi...

Question

The voice coil of a speaker has a diameter of 0.025 m, contains 55 turns of wire, and is placed in a 0.10 T magnetic field. The current in the voice coil is 2.0 A. Determine the magnetic force that acts on the coil and the cone.

Zero

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0.016 N

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0.43 N

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0.86 N

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Solution

The correct option is D
0.86 N

F = ILB sin φ
= (2.0 A)[55 (0.025 m)](0.10 T)sin 90^o
F = 0.86 N

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The voice coil of a speaker has a diameter of 0.025 m, contains 55 turns of wire, and is placed in a 0.10 T magnetic field. The current in the voice coil is 2.0 A. Determine the magnetic force that acts on the coil and the cone.

The correct option is D 0.86 N F = ILB sin φ = (2.0 A)[55 (0.025 m)](0.10 T)sin 90o F = 0.86 N

The correct option is D
0.86 N

F = ILB sin φ
= (2.0 A)[55 (0.025 m)](0.10 T)sin 90^o
F = 0.86 N