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phy202_lect21

# Ield b along the axis of solenoid i to the magnetic

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Unformatted text preview: ual currents are present in the two solenoids, the ratio of the magnetic b. ield B .along the axis of solenoid I to the magnetic field B along the axis of solenoid II, B /B , is f 4 aI II I II a. µ I 1/4. 0 b. 1/2. c. . c. 2 a 1. d. µ 0 I 2 d. . e. 4. a 2µ 0 I e. . a Some Difficult Problems ____ 19. A square coil (length of side = 24 cm) of wire consisting of two turns is placed in a uniform magnetic field that makes an angle of 60° with the plane of the coil. If the magnitude of this field increases by 6.0 mT every 10 ms, what is the magnitude of the emf induced in the coil? 5 a. 55 mV b. 46 mV c. 50 mV d. 60 mV e. 35 mV ____ 20. A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 1 2-Ω load resistor? Demo: Hertz Experiment In 1887, Heinrich Hertz first demonstrated that EM fields can transmit over space. Hertz Experiment: Conceptual Schematic Sources of E and B Fields q༇  Sources for the electric field: §༊  Electric charges (Coulomb's Law, static) à༎subjects of past several weeks §༊  Change of B field (Faraday's Law, varying in time) q༇  Sources for the magnetic field: §༊  Electric current (Biot-Savart Law/Ampere’s Law, static) §༊  Change of E field (Ampere-Maxwell Law, varying) è༎ All these features are summarized in Maxwell Equations. Review: (1) Gauss’s Law / Coulomb’s Law q༇  The relation between the electric flux through a closed surface and the net charge q enclosed within that surface is given by the Gauss’s Law ∫ q E • dA = ε0 (2) Gauss’s Law for Magnetism q༇  The Gauss’s Law for the electric flux is a reflection of the existence of electric charge. In nature we have not found the equivalent, a magnetic charge, or monopole q༇  We can express this result differently: if any closed surface as many lines enter the encl...
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