Self-Inductance
- \ emf induced in loop opposing initial direction of current flow because it opposes increasing flux (Faraday’s Law)
- Self-Induction: the act of a changing current through a loop inducing an opposing voltage in that same loop.
- Consider the loop at the right, Rloop=0.
- \ magnetic field produced in the area enclosed by the loop. (B proportional to I)
- \ flux through loop increases as the current increases
- switch closed Ž current starts to flow in the loop.
this emf causes V(a) > V(b)
- Fact: the current turns on at such a rate to give V(a)-V(b) = battery voltage:
(is it infinite??) I=V/0!!!
No. “inductance” limits dI/dt