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Question

A wire carries a steady current of 2.4 A. A straight section of the wire is 0.75 m long and lies along the x axis within a uniform magnetic field, B = (1.6 k) T. If the current is in the + x direction, what is the magnetic force on that section of wire?



A

2.88 N along positive y-axis

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B

2.88 N along negative y-axis

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C

1.44 N along positive y-axis

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D

1.44 N along negative y-axis

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Solution

The correct option is B

2.88 N along negative y-axis


F = I L x B
F = I L B
F = (2.4 A)(0.75 m)(1.6 T)
F = 2.88 N
From the diagram, we find that this force acts in the negative y-direction
F = - 2.88 N j


Physics

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