You can move a permanent magnet into a coil and measure the induced current (see

Question

You can move a permanent magnet into a coil and measure the induced current (see the figure below). If you find a positive value of the cirrent when you bring the north pole of the magnet closer, you expect to find a negative value

a) only when you bring the south pole of the magnet closer

b) only when you move the north pole of the magnet away

c) both when you move the north pole away or bring the south pole closer

FIGURE 29-2 (a) A current is induced when a magnet is moved toward a coil, momentarily increasing the magnetic field through the coil. (b) The induced current is opposite when the magnet is moved away from the coil (B decreases) Note that the galvanometer zero is at the center of the scale and the needle deflects left or right, depending on the direction of the current. In (c), no current is induced if the magnet does not move relative to the coil. It is the relative motion that counts here: the magnet can be held steady and the coil moved, which also induces an emf. Magnet moves up toward coil B in coil increasing) (b Magnet moveS down (B in coil movement (B in coil constant) decreasing) SECTIO

Explanation / Answer

both when you move the north pole away or bring the south pole closer

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