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?
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- 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?31. A single loop of wire of radius 0.23 m is placed in a 0.75 T magnetic field as shown. The magnetic field is changed to a strength of 0.50 T in the opposite direction in 0.61 s. X D. X X X X X +0.23 m Before X X X B X X What is the average emf induced in the coil? A. 0.068 V B. 0.094 V C. 0.34 V 0.47 V 0.23 m After Ein 10 ● B9. A uniform magnetic field is directed normal to the plane of a wire that has been formed into a circular ring of radius, r = 3.1 cm. The magnetic field is uniform in space, but changes with time. The resistance of this ring is R = 2.0 2. A steady current of i = 2.5 mA flows through the wire. How fast is the magnetie field changing?
- 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?A conducting wire loop of radius 12 cm, that contains a 4.0-2 resistor, is in the presence of a uniform magnetic field of strength 3.0 T that is perpendicular to the plane of the loop. If the magnetic field is turned off in a time of 0.50 s, what is the current induced in the loop? a. 52 mA b. 68 mA O c. 95 mA d. 117 mA O e. 168 mA6. A loop of a wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r= 0.18 m. The normal to the plane of the loop is parallel to a constant magnetic field of magnitude 0.79 T. What is the magnitude of the change in the magnetic flux that passes through the loop when, starting with the position shown in the drawing, the semicircle is rotated rough half a revolution? Wb B (into paper)
- A square loop made of a metal wire is placed on the page. The length of both sides of the square decreases uniformly from 4.0 cm to 3.0 cm in 25 seconds. The loop is in a constant, uniform magnetic field directed out of the page and with a magnitude of 6.0 T. 1 cm = 0.01 m. 1. What is the average magnitude of the induced EMF produced in the loop during that time? 2. What is the direction of the induced electric current in the loop (explain in terms of B lines)?In 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 Hz6. A loop of a wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.18 m. The normal to the plane of the loop is parallel to a constant magnetic field of magnitude 0.88 T. What is the magnitude of the change in the magnetic flux that passes through the loop when, starting with the position shown in the drawing, the semicircle is rotated through quarter of a revolution? Wb B (into paper) 190of19 oof19 oon9 oof 19.0of19 oof19 o 19 0of19 oof19 oo of19 oof oof19 19 0of19 0of19 oof19 oof19 o0
- A 25-turn circular coil has radius of r = 3 [cm] and a resistance of R = 10 [Q]. The coil is in a uniform magnetic field of 0.46 [T] that is perpendicular to the plane of the coil. a. magnetic flux? What is the value of the b. What is the value of the induced emf and the induced current in the coil? lemf| = [V] I = [A] Now, the value of the magnetic field is increasing from 0.46 [T] to 2.1 [T] in At = 1.4 [s]. C. emf? lemf| I = What is the value of the induced [V] d. current in the coil? [A] What is the value of the inducedQ. What are the values of (a) L and 5. The secondary coil of a step-up transformer provides the voltage that operates an electrostatic air filter. The turns ratio of the transformer is 50:1. The primary coil is plugged into a standard 120-V outlet. The current in the secondary coil is 1.7 x 103 A. Find the power consumed by the air filter. 6. The earth's magnetic field, like any magnetic field, stores energy. The maximum strength of the