Wright, Mark R., 1854- · London : Longmans · leaf 235
trument, D and d are replaced by commutator-keys (fig. 225.) Magnetic field due to a current.—Dip the wire throughwhich a current is passing, into iron filings. The filings cling toit. When the circuit is broken the filings drop off (fig. 228). Fig. 228. The filings have been magnetised by… … Fig. 229-
Physics
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