. A text book of physics, for the use of students of science and engineering . ly with cotton, takingcare to keep them insulated from eachother. Attach to each free end a piece ofcopper wire A and B, and suspend the coilas in Fig. 903, so that the current mayenter at A and leave by B. Bring thepole of a bar magnet near each end ofthe solenoid in turn, and show by theattractions and repulsions that each endof the solenoid is a magnetic pole, oneend N and the other S. Verify the state-ment that on looking at the end of the coilat which the current travels in an anti-clockwise direction that end
. A text book of physics, for the use of students of science and engineering . ly with cotton, takingcare to keep them insulated from eachother. Attach to each free end a piece ofcopper wire A and B, and suspend the coilas in Fig. 903, so that the current mayenter at A and leave by B. Bring thepole of a bar magnet near each end ofthe solenoid in turn, and show by theattractions and repulsions that each endof the solenoid is a magnetic pole, oneend N and the other S. Verify the state-ment that on looking at the end of the coilat which the current travels in an anti-clockwise direction that end is a N end at which the current flows clock-wise is a S pole (Fig. 902).Repeat the experiment, using the coil of Expt. 218 in place of the barmagnet. Place a piece of iron rod in each coil and show that the poles are nowvery much stronger, but of the same kind as before. Force on a straight current in a magnetic field.—The results ofExpts. 218 and 219 show that electric-current circuits behave asmagnets. It is therefore evident that a conductor carrying a current. Fig. -Magnetic effect of asolenoid. 968 MAGNETISM AND ELECTRICITY CHAP. will experience a force when situated in a magnetic field. Thelaws governing this force are as follows : (i) The force on the conductor is at right angles to the planecontaining the direction of the current and that of the magneticfield. It is in the direction shown in Fig. 90-1, which may be remem-bered by the following Left-Hand Rule. Place the thumb, fore-fingerand middle finger of the left hand mutually at right angles to each
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