A coil of wire is connected to a meter. When a bar magnet is moved in and out of the coil, the meter records a current. The current results because Select one: O a. the coil acts like a transformer O b. the changing magnetic field induces a voltage in the wire Oc an electromagnetic wave is generated O d. the wire is ferromagnetic Clear my choice

3. DETAILS MY NOTES You are working during the summer at a company that builds theme parks. The company is designing an electromagnetic propulsion system for a new roller coaster. A model of a substructure of the device appears in the figure below. The rod is of length d = 1.00 m and mass m = 0.700 kg. The rod carries a current I = 100 A in the direction shown and rolls along the rails of length L = 15.0 m without slipping. The entire system of rod and rails is immersed in a uniform downward-directed magnetic field with magnitude 8 = 1.90 T. The electromagnetic force on the rod is parallel to the rails, causing the rod to roll to the right in the figure. When a full-scale device is produced, this rod will represent the axle of wheels on which the car and i on the grounds of the company. By projecting the rod from the rails in a horizontal direction from a height h = 1.80 m, the projection speed can be determined from how far from the ends of the rails the rod hits the ground. Your…

Question 1: #65       The 10-cm-wide, zero-resistance wire shown in Figure below, is pushed toward the 2.0 Ω resistor at a steady speed of 0.50 m/s.  The magnetic field strength is 0.50 T. a. What is the magnitude of the pushing force? b. How much power does the pushing force supply to the wire? c. What are the direction and magnitude of the induced current? d. How much power is dissipated in the resistor?

unstanding hard

What is the direction of the magnetic force on a negative charge that moves as shown in the figure? B Select one: O a. In O b. there is no magnetic force O. Out O d. Left When the light is passing from rarer to a denser medium, which is the correct statement? O a. speed becomes zero O b. speed of light increases speed of light remains constant O d. speed of light decreases

Two high-current transmission lines carry currents of 45 A and 78 A in the same direction and are suspended parallel to each other 28 cm apart. If the vertical posts supporting these wires divide the lines into straight 16 m segments, what magnetic force does each segment exert on the other? _N. Exponential format with 2 SẺ. QUESTION 14 An induced emf will occur if A. the strength of the magnetic field is changed. B. the coil's area is changed. C. the angle at which the magnetic field and the coil's area meet is changed. D. all of the above.

6. A loop of wire is placed in a magnetic field as shown. Which of the following would induce a clockwise current in the loop of wire? Making the magnetic field stronger Making the magnetic field weaker Leaving the magnetic field alone Increasing the wire's resistance

You put a magnet inside a coil of wire. Why is there not a current produced in the coil when the magnet is sitting in the wire? Select one: a. The magnet has to be very strong to cause current to flow. b. There has to be motion to cause current to flow. c. The wire has to have low resistance for current to flow. d. The magnetic field inside the coil isn't changing.

quantities increase except for a.) the speed of the bar. b.) the strength of the magnetic field. c.) the distance between the two conducting rods. d.) the resistance of the resistor. e.) All of the above increase the current generated by the apparatus; there are no exceptions. 3.) The resistance of an RLC circuit is doubled. What is true about the resonant frequency of the circuit? W。こ LC a.) The resonant frequency is doubled. b.) The resonant frequency is halved. c.) The resonant frequency is quadrupled. d.) The resonant frequency is reduced by a factor of 1/4th. e.) The resonant frequency is independent of resistance and therefore remains the same. 4.) At high frequencies, the reactances of an inductor and capacitor are N low