0. Ch. 28. Electromagnetic Induction. 0. Chapter Overview. Motional EMF Faraday’s Law Lenz’s Law Magnetic Flux Electric Generator Transformers. 0. Motional EMF. If a conductor moves perpendicular to a magnetic field, a potential difference is induced across the conductor
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A bar of length 10 cm closes a circuit as shown. The bar moves at 2.0 m/s perpendicular to a B-field of strength .25 T. a) Find the current in the circuit if the light bulb has a resistance of 5.0 Ω. b) Ignoring the resistance of the connecting wires find the potential difference across the light bulb. Label the higher and lower potential side of the light bulb.
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0A conducting coil is placed over an AC electromagnet. When the magnet is turned on what will the coil do?
A wire is formed into a loop of radius .050 m. The coil is oriented perpendicular to a uniform B-field of strength .075 T. a) Sketch the situation. b) The ends of the wire are pulled so that the wire collapses in a time of .060 s. Is an EMF induced? Explain. c) Find the magnitude of the induced EMF. d) If a 2.0 Ω resistor is connected across the ends of the wire, how much power is dissipated. Where did the power come from?
a) What must be the magnetic field strength so that a generator consisting of 1000 turns of a coil of radius 25 cm produces a peak output of 160 V when turned at a frequency of 60 Hz? b) Sketch a graph of the output of the generator.
Ex. To operate a neon sign a potential difference of 12000 V is needed. What must be the ratio of turns if the primary potential is 120 V?
A DC potential of 100 V is applied to the primary of a step-up transformer with turns ratio of 500. What is the potential difference across the secondary?
120 V ac is applied across the primary of a step down transformer with turns ratio 1/50. How does the power applied at the primary compare to that at the secondary? (Assume a lossless transformer)
0 transformer with turns ratio 1/50. How does the power applied at the primary compare to that at the secondary? (Assume a lossless transformer)Application to Power Generation
EX. a) Use Kirchhoff’s Voltage Law to find an equation for the current in the circuit. b) Find a solution if I(0) = 0.
Time Constant is given by L/R
Ex. An RL circuit w/o a battery has an initial current I E0. Sketch the circuit. b) Use KVL to find an equation for the current. c) Find I(t).