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Physics 2102

Physics 2102 Gabriela Gonz á lez. 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=N F B / I Solenoid inductance: L= m 0 n 2 Al

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Physics 2102

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

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

  3. 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

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

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