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Coupling factor:
If all the flux of a primary coil links with all the turns of a secondary then 100% coupling exists. Sometimes it is more convenient to use a coupling factor - k. Maximum Coupling (100%) is represented by a k value of 1.Thus if flux linkage is 97% the coupling factor is 0.97. Given that mutual coupling depends on k then so does the mutual inductance. The relationship is given by: M = k√ (L1 L2 )Where L1 and L2 are individual inductance's of the mutually coupled coils.The value of k depends on:• Purpose of coils involved• Relative positions of the coils• Frequency or rate of change of currentand can be as high as 0.98 or as low as 0.0001.
Specially designed diodes, which give out light radiations when forward biases. LED'S are made of GaAsp, Gap etc.
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faraday law of induction(differential and integral form)
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