(a) A coil of insulated wire is connected to a galvanometer. What would be observed if a strong bar magnet with its south pole towards one face of the coil is(i) moved quickly toward it?(ii) moved quickly away from it?(iii) held stationary near it?(b) Name the phenomena involved.(c) State the conclusion based on the observations in (i), (ii), and (iii).
(a) A coil of insulated wire is connected to a galvanometer and if a bar magnet with its south pole, towards one face of the coil, is
(i) moved quickly towards it, then a momentary deflection in the needle of the galvanometer to one side (left/right) is observed.
(ii) moved quickly away from the coil, then a momentary deflection in the needle of the galvanometer is observed, but now in the opposite direction.
(iii) held stationary near it, then no deflection is observed in the galvanometer.
(b) The phenomenon involved is known as electromagnetic induction.
(c) The conclusion based on the observations in (i), (ii), and (iii) is:
The motion of a magnet with respect to the coil induces an electric current in the coil which lasts as long as the motion is taking place in the magnetic field around a coil. But, as the magnet held stationary near it then no current or zero current is induced in the coil.
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