their combinedaction. A coil like that shown in Fig. 103 is called a 132 Elements of Physics. solenoid, and the current in passing through it producespolarity in it the same as in a magnet. Experiment 91.—Ar-range a solenoid, andsuspend it with the lowerend dipping in mercury(Fig. 104), so that it… … Fig. 104. Hold a straight current-bearing wire parallel to it, and compare itsaction with that of the magnetic needle. Add another similar coil, so made that it can be handled easily(Fig. 105), and while passing a strong current through both of them,test for polarity and othermagnetic properties.…
Physics
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