By Noel M. Morris (auth.)

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S are due to (1) self-induction, or (2) mutual induction, or (3) induction by motion; a brief explanation of these is given below. Self-induction If the current in a coil is increased, the magnetic flux produced by the current also increases. f. to be induced in the coil, and is due to the change of current in the coil. f. induced in a coil may be due to a change in the flux produced by a second coil, the magnetic flux from the latter linking the former; in this case the two coils are said to be magnetically coupled.

7 A solenoid of self-inductance 5 H carries a current of 2 A. Determine the energy stored in the magnetic circuit. 5 A, determine (a) the new value of stored energy and (b) the energy released into the electrical circuit. f. to be induced in the other. The coils are said to be closely coupled when the majority ofthe flux links both coils; an example where this occurs is in power transformers, where high efficiency is a primary consideration. Coils are said to be loosely coupled when only a small proportion of the total flux links both coils; this type of coupling is used in certain types of radio, television and communications circuits.

Transformers are needed to convert from one voltage level to another. 15 H. f. induced in the secondary winding during this period of time, and (b) if the secondary is wound with 400 turns, determine the change in the flux which mutually links the coils. 3 A, dt = 10 X l0- 3 s. 1125 mWb w- 49 = Nd

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