When a conducting rod of length L is moved along the wire rails through a uniform magnetic field (B) into the screen with speed v to the right, what is direction of induced current in the loop? Hint: Watch motional emf PCQ video! Use the 4-step method in determining the direction of induced current as discussed in class. EF: A. Clockwise B. Counterclockwise C. No induced current
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- Passage: The metal equilateral triangle in the figure, 20 cmcm on each side, is halfway into a 0.10 TT magnetic field.(Figure 1) Question A. What is the magnetic flux through the triangle? in Wb Question B. If the magnetic field strength decreases, what is the direction of the induced current in the triangle? a. clockwise b. coutnerclockwiseIn the image below, two conducting rings are in the same plane. The outer ring contains a resistor R, while the inner ring has a clockwise current /that is increasing in magnitude. You may assume that the magnetic field that is generated by the inner ring is negligible outside the ring. The induced current through R R. O goes from b to a O goes from a to b. O doesnt' exist. There is no induced current through R.R OF е Fapp Figure P20.18 2003 Thomson Brooks Cole (c20p18) Consider the arrangement shown in Figure P20.18. Assume that R = 7.00 £2 and I = 1.00 m, and that a uniform 1.60-T magnetic field is directed into the page. At what speed should the bar be moved to produce a current of 0.400-A in the resistor?
- Please Help ASAP!!!1. Recall the induction example from lecture in which a resistanceless metal bar with length & slides to the right on metal rails with a constant speed v and the metal rails are connected to a resistor R. The entire system is placed in a uniform constant magnetic field with magnitude B pointing out of the screen. е R a) Use Lenz's last to determine the direction in which the induced current flows. b) In lecture we simply assumed the bar moves with constant speed v. Show that an external force is needed to ensure the bar travels right with constant speed and determine the magnitude of this force (Hint: there will be a magnetic force on the bar due to the current flowing through it). c*) Show that the power dissipated in the resistor equals the rate at which work is done on the bar by the external force.A circular loop in the plane of the page/screen lies in a 0.65T magnetic field pointing into the page/screen. The loop's diameter changes from 20.0cm to 6.0cm in 0.50s. What is a) The formula you use to solve this problem? b) the direction of the indiuced current? c) the magnitude of the average induced emf? d) the average induced current if the coil resistance is 2.5ohms?
- Chapter 30, Concept Question 04 The figure shows two circuits in which a conducting bar is slid at the same speed v through the same uniform magnetic field and along a U- shaped wire. The parallel lengths of the wire are separated by 24 in circuit 1 and by L in circuit 2. The current induced in circuit 1 is counterclockwise. e (2) Is the magnetic field into or out of the page? Into Out of Is the current induced in circuit 2 clockwise or counterclockwise? Counterclockwise Clockwise Is the emf induced in circuit 1 larger than, smaller than, or the same as that in circuit 2? Larger The same as Smaller6. 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 * NEC2: 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?
- thanks!18. If you have circular wire with a current I, and you in- crease I via external means, is there an induced current in the loop separate from the externally applied increase in I? A. B. C. Yes No Maybe, there's not enough information to tellIn an AC generator, the magnetic field between the pole faces of the magnet is uniform and of strength 12 T, while the 400-cm2-area loop has 300 turns. What must be the frequency in Hz of the rotating loop so that the peak voltage from the generator is 100 kvolts? a. 70 Hz b. 90 Hz c. 50 Hz d. 110 Hz e. 130 Hz