Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 561
Rule 2. Ascertainthe N-pole of the sole-noid or electro-magnetwith a magnetic needle, and place the palm of the right hand upon the solenoid so that the outstretched thumb points in the direction of the N-pole; the fingers will point in the direction in which the current passes in the windings.… … PlO. 427. Section XVII. ELECTEODTNAMICS. AMPiiREs THEORY OF MAGNETISM. 611. Mutxial action of currents oh one another.—We havehitherto discussed the direction of the magnetic field due toa straight current, have determined the direction which atest-needle takes in virtue of the action of the…
Physics
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