A bar magnet is let fall toward the center of a conducting loop of wire, with the north pole oriented downward. Viewed from the same side of the loop as the magnet, as the north pole approaches the loop, what is the direction of the induced current? Parallel to the length of the magnet. Counterclockwise Clockwise zero
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- The component of the external magnetic field along the central axis of a 69 turn circular coil of radius 47.0 cm decreases from 2.90 T to 0.700 T in 2.10 s. If the resistance of the coil is R = 3.00 §, what is the magnitude of the induced current in the coil? magnitude: What is the direction of the current if the axial component of the field points away from the viewer? counter-clockwise clockwise AA 130 turn , 2.10 cm diameter coil is at rest in a horizontal plane. A uniform magnetic field 60° away from vertical increases linearly from 0.620 T to 1.66 Tin 0.650 s. Figure 1 of 2 > Vertical 60° CoilsA 20 turn circular loop with diameter 3 cm is placed in a magnetic field of strength 7 T such that the loop’s area vector is parallel to the magnetic field. The magnetic field is reduced to 0 T over some time and this generates a constant voltage of 5 V. How long did it take for the magnetic field to reduce to 0? 3.23 s 15.32 s 0.0198 s 0.0389 s None of the above
- 7A stationary square coil of area 0.1 m2 is brought over time of 2 s into the magnetic field 8.8 T with its plane perpendicular to the magnetic field. The coil has 1317 turns. Calculate the magnetic flux linkage through the coil. Give your answer in Sl units. Answer: Choose... +A student performs a lab using a pair of coils with radius R = 10.5 cm and N = 95 windings. Using the equation in the theory, calculate the magnetic field at the center of both coils when the coil current is 4.7 A.
- The figure shows a uniform magnetic field that is normal to the plane of the conducting loop of resistance R. Note: the area of the non- circular portion of the circuit is negligible compared to that of the loop. B 04 Which entry in the table below correctly pairs the change in the system with the direction of the induced current through R? change in the system direction of current through R decrease the area of the loop rotate loop into the paper decrease the magnitude of B increase the area of the loop pull loop to the right from top toward bottom no induced current from bottom toward top from bottom toward top from top toward bottomA coil of ten turns of area 0.01 m2 and resistance 5 Q is placed perpendicularly inside a magnetic field whose intensity and direction changes as given in the figure. B(T) 2 0.1 0.3 0.5 0.8 0.9 t(s) -2 QUESTION 5 How much power is dissipated by the coil at time = 0.6 seconds? O 0.2 W O 0.4 W O 0,5 W O None of theseC 12:52 HW8_60e193652a3a1c9d2d... 2. 2 of 4 SOS Done The 5.2 m long metal rotor blades of a helicopter spin at 6.0 revolutions per second perpendicular to the earth's magnetic field of 4.7x10 T. Axis What is the magnetic flux swept out by the rotor blades in one revolution and what is the emf induced between the axis and tip of a rotor blade? 3. In a CRT electrons are accelerated from rest by a potential difference of 1.40x10'V These electrons enter a magnetic field with a strength of 2.20x102 T Assuming the electrons are traveling perpendicular to the field what id the radius of the are of the deflected electrons?
- You have a solenoid with an initial current of 386 A and a turn density of 6088 What is the initial magnetic field through the solenoid? Binitial = 2.95 T The current in the solenoid drops to 51 A over the course of 1.1 ms. What is the final magnetic field through the solenoid? Bfinal = T Inside the solenoid is a coil with 75 loops and a radius of 9.0 cm. The coil is aligned so that the magnetic field from the solenoid passes through the coil perpendicular to the plane of the coil (directly down the center of the coil). What is the magnitude of the induced emf in the 75-turn coil at the center of the solenoid during this change in magnetic field? Enter you answer as a positive number. emf = V The coil has a resistance of 20 2. What is the current through the coil? Icoil A loops m = What is the power dissipated by the coil? Pcoil = WYou drop a magnet north pole side down from a height (h) into a loop of wire, inducing a current. Draw a graph showing how the induced current in the loop depends on time as the magnet falls through the loop. Does the magnitude of the induced current depend on h?6. 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