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Dot Convention

Mutual inductance is a positive quantity; but the sign of e.m.f. induced by it depends on the direction of winding of the coils.
 
In circuit analysis, the dot convention is a convention used to denote the voltage polarity of the mutual inductance of two components. Two conventions are:
  1. If a current enters the dotted terminal of one coil, then the polarity of the e.m.f. induced in the second coil will be positive at the dotted terminal of the second coil.
  2. If a current leaves the dotted terminal of one coil, then the polarity of the e.m.f. induced in the second coil will be negative at the dotted terminal of the second coil. 




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