. The principles underlying radio communication . sed coil of wire, Fig. the time the magnet is moving there will be indicationson the galvanometer r/ that current is flowing. When the mag-net is drawn back, away from the coil, a current is induced inthe opposite direction. The direction of this induced currentwill always be such as to oppose the change to which it is due. INDUCTANCE. 109 That is, if the magnet is approaching the coil, the current willflow in AB so that A is a north pole, and hence the magnetwill be repelled. If the key A: is open, the induced current cannot flow. If
. The principles underlying radio communication . sed coil of wire, Fig. the time the magnet is moving there will be indicationson the galvanometer r/ that current is flowing. When the mag-net is drawn back, away from the coil, a current is induced inthe opposite direction. The direction of this induced currentwill always be such as to oppose the change to which it is due. INDUCTANCE. 109 That is, if the magnet is approaching the coil, the current willflow in AB so that A is a north pole, and hence the magnetwill be repelled. If the key A: is open, the induced current cannot flow. If it is closed, an induced current does flow, andsets up a magnetic field about the coil. It can be shown thatmore work is required^-to move the magnet with respect to thecoil when the key is closed than when it is open. These factsare expressed in the law of Lenz, which states that wheneveran induced current arises, by reason of some change in Unkings,the magnetic field about the induced current is in such a direc- rt<;2H<v Fl<^ 65. I
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