EC2: A magnet moves through the opening within a closed wire loop, and then comes to rest, relative to the loop. The loop is attached only to a meter that displays the current running through it (and not to any emf device). a. As the magnet is moving relative to the loop, does the meter register a non-zero current? b. When the magnet is at rest relative to the loop, does the meter register a non-zero current? c. What is meant by the statement that magnetism is a "relativistic" effect of electricity?

In an alternator magnets are rotated within windings of conductive wire to produce an emf, is this motional emf or induced electric field emf?     In an electric generator windings of conductive wire are rotated through a magnetic field to produce an emf, is this motional emf or induced electric field emf?

in the figure below, a square loop with 10 turns that is 10.0 cm on a side has a magnetic field pointed into the page that is decreasing at the rate of 1.0 T/s.   a) What is the magnitude of the emf generated in the wire  and what is the direction of the resulting current along the top side of the loops?       b) Assume the self inductance is 4.1 x 10-4 H and the wire’s resistance is 11 Ohms.  How much energy is stored by the inductor while the magnetic field is decreasing at this fixed rate?

5. A jet airplane with a 75.0 m wingspan is flying at 280 m/s. What emf is induced between wing tips if the vertical component of the Earth's field is 3.00 x 10-5 T? 6. As shown in the figure, a wire and a 10-N resistor are used to form a circuit in the shape of a square with dimensions 20 cm by 20 cm. A uniform but non-steady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is steadily decreased from 2.70 T to 0.90 T in a time interval of 96 ms. What is the induced current in the circuit, and what is its direction through the resistor? - 20 cm → 20 cm ww a 10 Ω X X X X X X

5. A circular loop in the plane of the paper lies in a 0.65 T magnetic field pointing into the paper. The loop's diameter changes from 20.0 cm to 6.0 cm in 0.50 s. Find: a. The direction of the induced current. b. The magnitude of the average induced emf, and

A 1 kg horizontal aluminum bar, 0.1 m long, is pushed by a force F between two vertical metal rods that are 0.1 m apart. A 0.1T magnetic field is directed perpendicular to the plane of the rods as indicated. A 5 Q resistor is connected across the two rods at the bottom. What is the direction of the current through the aluminum bar? Aluminum bar

A capacitor is charging in a simple RC circuit with a dc battery. Which one of the following statements about this capacitor is accurate? There is no magnetic field between the capacitor plates because no charge travels between the plates. There is a magnetic field between the capacitor plates, even though no charge travels between them, because the magnetic flux between the plates is changing. The magnetic field between the capacitor plates is increasing with time because the charge on the plates is increasing. There is a magnetic field between the capacitor plates because charge travels between the plates by jumping from one plate to the other. There is a magnetic field between the capacitor plates, even though no charge travels between them, because the electric flux between the plates is changing.

25. A long, straight wire is in the same plane as a rectangular, conducting loop. The wire carries a constant current I as shown in the figure. Which one of the following statements is true? A. There will be no induced current. B. There will be a clockwise induced current in the loop. C. There will be a counterclockwise induced current in the loop. I

6. The conducting rod shown in the accompanying figure moves along parallel metal rails that are 25-cm apart. The system is in a uniform magnetic field of strength 0.75 T, which is directed into the page. The resistances of the rod and the rails are negligible. a. What is the emf (including its sense) induced in the rod when it is moving to the right with a speed of 5.0 m/s? b. What force is required to keep the rod moving at this speed? c. What is the rate at which work is done by this force? d. What is the power dissipated in the resistor? B x M x x t x 25 cm 5.0 m/s 0.25 N * N

Words RE English (US) 4. A coil with 105 turns and an area of 1.45 m² is rotating in a magnetic field of 2.3 T. The coil is rotating at a rate of 25° per second. a. What is the induced emf in the ring? Choose the specific case of the coil moving from 0° to 25°. b. The ring has a resistance of 1.4 2. What is the current in the ring? C. What is the power dissipated in the ring? I