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Unformatted text preview: Physics 227: Lecture 21 Mutual Inductance, LC Circuits • Lecture 20 review: • Selfinductance of coil of wire: ξ induced = N d Φ B /dt = L di/dt, with L = N Φ B /i. • Solenoid: L = μ n 2 V with n the turns/unit length and V the volume. • RL circuit time constant τ = L/R. • Energy stored in an inductor: U = ½ LI 2 . • Energy density of magnetic Feld Flling volume: u = ½ B 2 / μ . Monday, November 28, 2011 Exam 2 Results • Average: 60% , same as exam 1 • Easiest problems: RC circuit time constant(90%), radius formula for safe wire (88%), drift speed formula of electrons in wire (84%), ... • Hardest problems: energy change when current carrying coil in B Feld ¡ipped 180 o (22%), Feld between two inFnite current sheets (22%), relative magnitude of electric and magnetic forces between two equal charges (37%), ... Monday, November 28, 2011 Review RL iClicker The switch S1 is closed so that a current fows through an inductor oF inductance L and a resistor oF resistance R as shown. The ¡nal value oF the current with S1 closed and S2 open is... A. proportional to RL. B. proportional to a ratio oF R and L....
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This note was uploaded on 01/03/2012 for the course PHYSICS 750:227 taught by Professor Ronaldgilman during the Fall '11 term at Rutgers.
 Fall '11
 RonaldGilman
 Physics, Inductance

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