A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 807
form of the field dueto a bar magnet is shown in Fig. 716. The strength of field atcertain points may be calculated without difficulty. Thus, take a point P (Fig. 724) onthe line passing throughthe poles of the magnet ofpole strength m. Let Ibe half the length of themagnet and d the distanceof P… … ■l-*--l~ d - Fig. 724.—Strength of field due to a bar magnet, bycalculation. {d + lf Since these two forces are in the same line but have opposite senses, we have Resultant force = m m = m (d-lf {d + lf (d + lf -(d -If(d2-l2f \iiil . d
Physics
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