2) A uniform bar has mass 0.0120 kg and is 30.0 cm long. It pivots without friction about an axis perpendicular to the bar at point a (see figure below). The gravitational force on the bar acts in the -y direction. The bar is in a uniform magnetic field that is directed into the page and has magnitude B = 0.150 T. (a) What above the horizontal? (b) For the bar to be in rotational equilibrium, should I be in the direction from a to b or b must be the current I in the bar for the bar to be in rotational equilibrium when it is at an angle 0=30.0 degrees to a? You can use only formulas given on the formula sheets. 2 9 20 X X x Piot لى center otational equibr Tgravity gravity I mg gravity + magnetic = O in (Q) LX BX Co (0) Right ide Tt H +7 effect O ♡ >

2) A uniform bar has mass 0.0120 kg and is 30.0 cm long. It pivots without friction about an axis perpendicular to the bar at point a (see figure below). The gravitational force on the bar acts in the -y direction. The bar is in a uniform magnetic field that is directed into the page and has magnitude B = 0.150 T. (a) What above the horizontal? (b) For the bar to be in rotational equilibrium, should I be in the direction from a to b or b must be the current I in the bar for the bar to be in rotational equilibrium when it is at an angle 0=30.0 degrees to a? You can use only formulas given on the formula sheets. 2 9 20 X X x Piot لى center otational equibr Tgravity gravity I mg gravity + magnetic = O in (Q) LX BX Co (0) Right ide Tt H +7 effect O ♡ >

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 1P: A proton travels with a speed of 3.00 106 m/s at an angle of 37.0 with the direction of a magnetic...

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12.4 Check Your Understanding Two wires, both carrying current out of the page, have a current of magnitude 2.0 mA and 3.0 mA, respectively. The first wire is located at (0.0 cm, 5.0 cm) while the other wire is located at (12.0 cm, 0.0 cm). What is the magnitude of the magnetic force per unit length of the first wire on the second and the second wire on the first?
Check Your Understanding A uniform magnetic field of magnitude 1.5 T is directed horizontally from west to east, (a) What is the magnetic force on a proton at the instant when it is moving vertically downward in the field with a speed of 4 x 107 m/s? (b) Compare this force with the weight w of a proton.
Calculate the magnitude of the magnetic field at a point 25.0 cm from a long, thin conductor carrying a current of 2.00 A.
A circular coil of radius 5.0 cm is wound with five turns and carries a current of 5.0 A. If the coil is placed in a uniform magnetic field of strength 5.0 T, what is the maximum torque on it?
A 5.0-m section of a long, straight wire carries a current of 10 A while in a uniform magnetic field of magnitude 8.0103T . Calculate the magnitude of the force on the section if the angle between the field and the direction of the current is (a) 45°; (b) 90°; (C) 0°; or (d) 180°.
A wire ismade into a circular shape of radius R and pivoted along a central support.The two ends of the sire are touching a banish that is connected to a &power source. The stricture is between the poles of a magnet such that we can assume there is a uniform magnetic field on the wire. In terms of a coordinate system with origin at the center ofthe ring, magneticfieldisBx=B0,By=Bz= 0. and the ring rotates about the z-axis. Find the torque on the ring siren it is not in the xz-plane.
A long-rigid wire lies along the x-axis and cairns a current of 2.5 A in the positive x-direction. Around the wire is the magnetic field B=2.0i+5.0x2j, With x in meters and B in millitesla. Calculate the magnetic force on the segment of wire between x=2.0m and x=4.0m .
When the current through a circular loop is 6.0 A, the magnetic field at its center is 2.0104 T. What is the radius of the loop?
A singly charged ion takes 2.0 × 10-3 s to complete eaglet revolutions in a uniform magnetic field of magnitude 2.0102 T. What is the mass of the ion?
Three long, straight, parallel wires, all carrying 20 A, are positioned as shown in the accompanying figure. What is the magnitude of the magnetic field at the point P?
A long, straight, horizontal wire carries a left-to-right current of 20 A. If the wire is placed in a uniform magnetic field of magnitude 4.0105 T that is directed vertically downward, what is tire resultant magnitude of the magnetic field 20 cm above the wire? 20 cm below the wire?
Acircularcoiofwireofradius5.Ocmhas2Otums and carries a current of 2.0 A. The coil lies in a magnetic field of magnitude 0.50 T that is directed parallel to the plane of the coil. (a) What is the magnetic dipole moment of the coil? (b) What is the torque on the coil?