A permanent magnet is held directly below the center of a coil which is connecte

Question

A permanent magnet is held directly below the center of a coil which is connected to a voltmeter. As you move the magnet closer towards the coil, the voltmeter reads positive.
Which of the following statements is always true?
Twisting the magnet clockwise about its long axis would produce a negative voltage readout.
Turning the magnet clockwise about an axis perpendicular to the paper (such that "North" would increasingly point right) would produce a positive voltage readout.
Moving the magnet farther away from the coil would also produce a positive voltage reading.
If you had turned the magnet around so that "South" would be on top, then moving it closer towards the coil would still produce a positive voltage readout.
Moving the magnet to the left would produce a negative voltage readout.
The closer to the coil the magnet is held in place, the higher the magnitude of the voltage.
Moving the magnet to the right would produce a positive voltage readout.

The coil has a radius of 5 cm and 110 turns. While moving the magnet closer towards the coil, at a certain point in time, the voltage meter shows 370 mV. What is the magnitude of the rate of change of the flux through the coil? (in mV)

A permanent magnet is held directly below the center of a coil which is connected to a voltmeter. As you move the magnet closer towards the coil, the voltmeter reads positive. Which of the following statements is always true? Twisting the magnet clockwise about its long axis would produce a negative voltage readout. Turning the magnet clockwise about an axis perpendicular to the paper (such that North would increasingly point right) would produce a positive voltage readout. Moving the magnet farther away from the coil would also produce a positive voltage reading. If you had turned the magnet around so that South would be on top, then moving it closer towards the coil would still produce a positive voltage readout. Moving the magnet to the left would produce a negative voltage readout. The closer to the coil the magnet is held in place, the higher the magnitude of the voltage. Moving the magnet to the right would produce a positive voltage readout. The coil has a radius of 5 cm and 110 turns. While moving the magnet closer towards the coil, at a certain point in time, the voltage meter shows 370 mV. What is the magnitude of the rate of change of the flux through the coil? (in mV) Tries 0/10

Explanation / Answer

Given that

r = 5 cm = 0.05 m

N = 110

E = 370 mV

E = N [ d@ / dt ]

d@ / dt = E / N

= 370 x 10-3 / 110

= 3.363 x 10-3 Wb

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