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what is self induction?
Self induction is that phenomenon in which a change in electric current in a coil produces an induced emf in the coil itself.
When current in a coil increases or decreases, there is a change in magnetic flux linking the coil.Hence, the e.m.f. is induced in the coil.
This induced e.m.f. will oppose the change of current in the coil.
                                              
                V(opposing)   = -L*(change in current/change in time)
                                      
where L is the self-inductance of the circuit,measured in henry.


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