Exam review Inductors, EM oscillations

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Presentation transcript:

Exam review Inductors, EM oscillations Physics 2102 Gabriela González Physics 2102 Exam review Inductors, EM oscillations

Exam review Q1: 75.7 P1: 61.6 Q2: 67.2 Q3: 79.2 P2: 58.2 P3:52.2

Inductors Inductance definition: L=NFB/I Solenoid inductance: L=m0n2Al Induced emf (voltage) across an inductor is E=-L di/dt In an RL circuit, we can “charge” the inductor with a battery until there is a constant current, or “discharge” the inductor through the resistor. Time constant is L/R. An inductor stores magnetic potential energy: UB=Li2/2 Energy density stored in a magnetic field is uB=B2/2m0

EM oscillations An LC combination produces an electrical oscillator, the natural frequency of oscillator is w=1/LC Total energy in circuit is conserved: switches between energy stored in capacitor (electric energy) and in inductor (magnetic energy). If a resistor is included in the circuit, the total energy decays (is dissipated by R). i(t)

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