International Library of Technology · Scranton, International Textbook Co. · leaf 115
elix of about \ in. diameter and of about 16 turns, {a) Send ^ ELECTRICITY AND MAGNETISM. 1549 a current from the battery through this helix; will the endof the helix attract the compass needle if held near it ? (d)Why ? (c) How can you determine beforehand which poleof the compass needle will be… … Fig. 950. as possible to one end of the helix place the compass, asshown in Fig, 950. Send a current through the coil andnote the deflection of the compass needle in degrees. Inside the coil place the following substances and notethe effect on the needle, the current still circulating in thehelix:…
Electrical engineering
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