1. A square loop of wire lies in the plane of the page. A decreasing magnetic field is directed into the page. The induced current in the loop is a. clockwise b. counterclockwise c. into the page d. out of the page 2. Consider a coil of wire that is placed in a region of X X хх X X uniform magnetic field. If the coil is being squeezed X X x X X X (marked by arrows), the direction of the induced emf X/ X X through the loop is c. into the page X X X X X X a. clockwise b. counterclockwise d. out of the page 3. A long straight wire that carries a constant current I approaches a loop of wire as shown in the figure. The current through the wire is directed to the right. While the wire is approaching the loop, the directions of the induced magnetic field B at the center of the rectangle and the induced current through the loop are respectively. a. B: into the page; I: clockwise b. B: out of the page; I: counterclockwise c. B: into the page; I: counterclockwise

1. A square loop of wire lies in the plane of the page. A decreasing magnetic field is directed into the page. The induced current in the loop is a. clockwise b. counterclockwise c. into the page d. out of the page 2. Consider a coil of wire that is placed in a region of X X хх X X uniform magnetic field. If the coil is being squeezed X X x X X X (marked by arrows), the direction of the induced emf X/ X X through the loop is c. into the page X X X X X X a. clockwise b. counterclockwise d. out of the page 3. A long straight wire that carries a constant current I approaches a loop of wire as shown in the figure. The current through the wire is directed to the right. While the wire is approaching the loop, the directions of the induced magnetic field B at the center of the rectangle and the induced current through the loop are respectively. a. B: into the page; I: clockwise b. B: out of the page; I: counterclockwise c. B: into the page; I: counterclockwise

Physics for Scientists and Engineers

10th Edition

ISBN:9781337553278

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter29: Sources Of The Magnetic Field

Section: Chapter Questions

Problem 37AP: A very large parallel-plate capacitor has uniform charge per unit area + on the upper plate and on...

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(a) If the emf of a coil rotating in a magnetic field is zero at t = 0, and increases to its first peak at t = 0.100 ms, what is the angular velocity of the coil? (b) At what time will its next maximum occur? (c) What is the period of the output? (d) When is the output first one-fourth at its maximum? (e) When is it next one-fourth at its maximum?
A rectangular conducting loop is placed near a long wire carrying a current I as shown in Figure OQS1.3. If I decreases in time, what can be said of the current induced in the loop? (a) The direction of the current depends on the size of the loop. (b) The current is clockwise. (c) The current is counterclockwise. (d) The current is zero. (e) Nothing can he said about the current in the loop without more information.
(a) An MRI technician moves his hand from a region of very low magnetic field strength into an MRI scanner's 2.00 T field with his fingers pointing in the direction of the field. Find the average emf induced in his wedding ling, given its diameter is 2.20 cm and assuming it takes 0.250 s to move it into the field. (b) Discuss whether this current would significantly change the temperature of the ring.
A very large parallel-plate capacitor has uniform charge per unit area + on the upper plate and on the lower plate. The plates are horizontal, and both move horizontally with speed v to the right. (a) What is the magnetic field between the plates? (b) What is the magnetic field just above or just below the plates? (c) What are the magnitude and direction of the magnetic force per unit area on the upper plate? (d) At what extrapolated speed v will the magnetic force on a plate balance the electric force on the plate? Suggestion: Use Amperes law and choose a path that closes between the plates of the capacitor.
A uniform magnetic field is directed along the x axis. For what orientation of a flat, rectangular coil is the flux through the rectangle a maximum? (a) It is a maximum in the xy plane. (b) It is a maximum in the xz plane. (c) It is a maximum in the yz plane. (d) The flux has the same nonzero value for all these orientations. (e) The flux is zero in all cases.
A helicopter (Fig. P30.11) has blades of length 3.00 m, extending out from a central hub and rotating at 2.00 rev/s. If the vertical component of the Earths magnetic field is 50.0 T, what is the emf induced between the blade tip and the center hub? Figure P30.11
Unreasonable results To construct a non-mechanical water meter, a 0.500-T magnetic field is placed across the supply water pipe to a home and the Hall voltage is recorded, (a) Find the flow rate through a 3.00-cm-diameter pipe if the Hall voltage is 60.0 mV. (b) What would the Hail voltage be for the same flow rate through a 10,0-cm- diameter pipe with tire same field applied?