Notes On Electricity And Magnetism Designed As a Companion to Silvanus P Thom
Notes On Electricity And Magnetism Designed As a Companion to Silvanus P Thom
J B Joseph Ballard Murdock
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D (L cos 0) cos = dx 2. X Cr* At the centre of the circle the force is a maximum, and is = as in 195. The sign shows that with a posi- tive current the force is one of attraction. 38. Position of Equilibrium of a Circuit and Magnet. Consider the magnet as composed of two poles of strength m and m connected rigidly. -. The formula for the force in the field may be written = sin 3 0. The forces acting on the two poles are and /I 1 1 \ ^v. e X & > / A B --- sin r Fig. 10. The resultant force is ~ ...(sin^ - sin' G'). This is zero when = 0', or when the centre of the magnet is at the centre of the coil. In any other position there will be a force acting and the equilibrium will be unstable. If, there- fore, either the coil or magnet is free to move, the coil will NOTES ON place itself so that the middle of the magnet is at its centre. (See Fig. 87, " Thompson. ") 39. Mutual Potential of two Circuits ( 320). The work done in bringing one circuit up to another, or the " mutual potential " of the two circuits is, as given in , cos s | 320, cc .
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