we know that when some system that perform activity/work, energy needed. so, what about energy stored in magnetic field?
- Magnetic field-produced by
electric current
- 2 charged particles of
opposite sign-pulled away resulting electric potential energy ( stored
energy that make that charged come closed as we released them)
- When a electric current is
flowing in an inductor, there is energy stored in magnetic field
- Consider a pure inductor L,
the instantaneous power which must be supplied to initiate the current in
the inductor is:
So
the energy input to built to a final current I is given by the integral:
 |
| total energy stored by an inductor L carrying current i |
- noted that: same expression applied to energy stored by a capacitor C and charged q:
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