The figure below is a setup that can be used to measure magnetic fields. A recta

Question

The figure below is a setup that can be used to measure magnetic fields.

A rectangular coil of wire contains N turns has a width w. The coil is attached to one arm of a balance and is suspended between the poles of a magnet. The field is uniform and perpendicular to the plane of the coil. The system is first balanced when the current in the coil is zero. When the switch is closed and the coil carries a current I, a mass m must be added to the right side to balance the system.

Suppose the coil has 52 turns and width of 4.7 cm. When the switch is closed, the coil carries a current of 0.27 A, and a mass of 16.0 g must be added to the right side to balance the system. What is the magnitude of the magnetic field?
T

Explanation / Answer

NIwB = mg

==> 52*0.27*0.047*B = 0.016*9.8

==> B = 0.237 T

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