Left - A bar magnet being put through a wire loop. The \"number\" of field lines

Question

Left - A bar magnet being put through a wire loop. The "number" of field lines going through the loop is proportional to the magnetic flux through the loop. Right - A qualitative plot of the waveform seen on an oscilloscope as the magnet is put through the loop and stopped at the halfway point of the magnet. In Experiment 1, a permanent bar magnet is introduced into the detector coil and produce a waveform as seen in Figure 47. The magnet is stopped when it is halfway through the coil^29. Note that while the magnetic flux is proportional to the "number" of field lines^30 going through the loop, the induced emf is proportional to the change with time of the number of field lines going through the loop. For each of the points (A), (B), and (C) on the plot below, describe what is happening with: The magnetic flux The induced magnetic field The induced emf Match the following events with the waveforms (a, b and c) shown below. The bar magnet is introduced into the coil and held at the halfway point. The bar magnet is introduced into the coil and immediately withdrawn from the same end it came in. The bar magnet is dropped through the coil and falls under the influence of gravity.

Explanation / Answer

1) at the point A

i) the magnetic flux is increasing

ii) the induced magnetic field is oposing the applied magnetic force

iii) the induced emf is flowing

at point B

i) the magnetic flux is at the peak

ii) the induced magnetic field is oposing the applied magnetic force

iii) the induced emf is flowing

at the point C

i) the magnetic flux is decreasing

ii) the induced magnetic field is in same direction the applied magnetic force

iii) the induced emf is flowing

2)

i) for this position , the magnetic flux is maximum

at the point B

ii)

this is shown by event B

iii) this is shown by the event ABC

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