Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 240.—The Movable Current-Carrying Coil is Repelled bythe Stationary Bar Magnet. Fig. 241.—The Flexi-ble Tinsel Wire WindsAround the Magnetwhen a Current is SentThrough it. itself around thethat the polarity atfield as before. as the lines of force of the magnets fieldis further demonstrated as follows : a barmagnet is clamped vertically in a standand raised several inches from the table,Fig. 241, a connector is clamped above it,and a piece of tinsel wire, which is a veryflexible


Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 240.—The Movable Current-Carrying Coil is Repelled bythe Stationary Bar Magnet. Fig. 241.—The Flexi-ble Tinsel Wire WindsAround the Magnetwhen a Current is SentThrough it. itself around thethat the polarity atfield as before. as the lines of force of the magnets fieldis further demonstrated as follows : a barmagnet is clamped vertically in a standand raised several inches from the table,Fig. 241, a connector is clamped above it,and a piece of tinsel wire, which is a veryflexible conductor, is supported from theconnector and connected to a battery asshown. When the current is sent up thewire from A to B, the wire twists or windsitself around the magnet in a left-hands spiral, that is, so that the current cir-\ culates around the magnet anti-clock-wise as viewed from the N-pole current, therefore, tends to increasethe magnetism of the magnet and thelines of force of both are in the samedirection. When the current is reversed,the tinsel unwinds and again twistsmagnet in


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