A bar magnet is moving in the direction of U next to a circular coil, as shown in the figure. What is the direction of the induced current in the loop, as viewed from the left side of the figure? Select one:
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- A solenoid sits in front of you and you are facing one end. You move the south end of a bar magnet further away from the end of the solenoid that you are facing. What will the direction of the induced current in the solenoid be as you move the bar magnet further from the solenoid (from your perspective)? clockwise counter-clockwise2. In Fig. 3 a rod of length 0.4 m is pulled to the right at a speed v= 2.0 m/s. The rod slides (frictionlessly) on a set of metal rails that do not move. A uniform magnetic field of magnitude 0.75 T saturates the area as shown by the X's. a. b. C. Determine the direction of the induced current in the rod. Calculate the absolute value of the induced EMF in the rod. X Suppose the electrical resistance of the rod is 2.0 Ohms but the rails have negligible resistance. Calculate the magnitude of the magnetic braking force on the rod. X X X X X X X X x X x Fig. 3 X B LA set of three conducting rings are hung from a ceiling as shown in the Figure and are in the same magnetic field B. The magnetic field is uniform and remains constant with respect to time. Ring 1 moves left and right as indicated, like a mass attached to a pendulum. Ring 2 rotates about a vertical axis, and Ring 3 moves up and down while attached to a spring. Which ring(s) will have an emf induced in them? 1 2 3. O Ring 3 only O Ring 2 only O Ring 1 only O Rings 2 and 3 Rings 1 and 2
- A metal rod moves with constant velocity along two parallel metal rails connected with strip of metal at one side as shown in Figure. A magnetic field B = 0.35 T points outof the page. If the rails are separated by distance ZL = 25 cm and the speed of the rod isv= 55 cm/s, find a) the induced emf and direction of induced currentb) the amount of heat released in this system in 3 min if the rod has resistance of 18 Qand the rails have negligible resistance.The figure below shows a rectangular, conducting loop sitting in the magnetic field of a straight wire carrying a current I. When the current I varies in time, a current is induced in the loop. Let’s assume that the current I in the straight wire decreases in time. It is observed that the induced current circulates clockwise in the loop.Use Faraday’s Law and Lenz’s Law to explain: a) Why a current is induced in the loop,b) Why the induced current circulates clockwise in the loop.A circle wire loop with 10 turns of wire has an area of 0.5 m2. It is initially in a 0.3 T magnetic field. Then over 0.5 seconds it is moved to a location with no magnetic field. What is the magnetic flux? (The unit of flux is Weber, W) What is the induced emf (voltage)?
- The loop in the figure has an induced current as shown. The loop has a resistance of 0.21 Ω. Is the magnetic field strength increasing or decreasing? What is the rate of change of the field, ΔB/tΔ?Ben coils a wire to create a solenoid that is 25-cm long with 300 turns. Mak coils a wire to create a solenoid that is 10-cm long with 200 turns. They place their solenoids in otherwise identical circuits so that the steady-state current is the same for each solenoid. Determine the ratio of the magnetic fields of the two solenoids BPh/BF.are three equal time intervals indicated in the graph: 0 - parallel to the normal to the loop. For purposes of this problem, this means that o 0.50 N. Determine the induced current for the first and third intervals. A magnetic field passes through a stationary wire loop, and its magnitude changes in time according to the graph in the drawing. The direction of the field remains constant, however. There 3.0 s, 3.0 - 6.0 s, and 6.0 – 9.0 s. The loop consists of 48 turns of wire and has an area of 0.15 m2. The magnetic field is oriented 0° in Equation 22.2. (a) For each interval, determine the induced emf. (b) The wire has a resistance of 0.40 0.20 3.0 6.0 t(s) 9.0 (а) £1 E2 = Ez = (b) I1 I3 = | > > >