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?
Moving the magnet farther away from the coil would also produce a positive voltage reading.
Moving the magnet to the right would produce a positive voltage readout.
The closer to the coil the magnet is held in place, the higher the magnitude of the voltage.
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.
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 produce a negative voltage reading instead.
Twisting the magnet clockwise about its long axis would produce a negative voltage readout.

The coil has a radius of 7 cm and 70 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)

i want someone give idea about this question

Explanation / Answer

1.true ----------> Moving the magnet farther away from the coil would also produce a positive voltage reading.

true------------->Turning the magnet clockwise about an axis perpendicular to the paper (such that "North" would increasingly point right) would produce a positive voltage readout.

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2. induced emf e = d(flux)/dt = NA(dB/dt)

dB/dt = d(flux)/dt *(1/NA) = 0.37

dlux = 0.37 /( 3.14*0.07*0.07* 70)

d(flux) = 0.343 Wb

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