Magnetic levitation A metal rod of length w= 12 cm and mass m = 50 grams has metal loops at both ends, which go around two metal poles (see the figure). p- mass of rod The rod is in good electrical contact with the poles but can slide freely up and down. The metal poles are connected by wires to a battery, and a current I= 8 amperes flows through the rod. A magnet supplies a large uniform magnetic field B in the region of the rod, large enough that you can neglect the magnetic fields due to the 8 ampere current. The large magnetic field is oriented to have the maximum effect. The rod floats at rest h-9 cm above the table. What is the magnetic field in the region of the rod? Assume +x is to the right, +y is up, and +z is out of the page. B- <0,0,.91875 > Which of the following statements are true? 2 If the conventional current in the bar were less than 8 A, the bar would fall. O The magnetic force on the bar is in the +y direction (upward). O If the conventional current in the bar flowed in the opposite direction (to the left), the bar would still float at rest 9 cm above the table.

Magnetic levitation A metal rod of length w= 12 cm and mass m = 50 grams has metal loops at both ends, which go around two metal poles (see the figure). p- mass of rod The rod is in good electrical contact with the poles but can slide freely up and down. The metal poles are connected by wires to a battery, and a current I= 8 amperes flows through the rod. A magnet supplies a large uniform magnetic field B in the region of the rod, large enough that you can neglect the magnetic fields due to the 8 ampere current. The large magnetic field is oriented to have the maximum effect. The rod floats at rest h-9 cm above the table. What is the magnetic field in the region of the rod? Assume +x is to the right, +y is up, and +z is out of the page. B- <0,0,.91875 > Which of the following statements are true? 2 If the conventional current in the bar were less than 8 A, the bar would fall. O The magnetic force on the bar is in the +y direction (upward). O If the conventional current in the bar flowed in the opposite direction (to the left), the bar would still float at rest 9 cm above the table.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter22: Magnetic Forces And Magnetic Fields

Section: Chapter Questions

Problem 61P

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