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Ch. 29

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HOMEWORK Ch. 29
(Quiz on May 5,2016)

1. An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If
Bx = 0, what is the direction of the magnetic field? (negative y direction)
2. A 2.0-C charge moves with a velocity of (
) m/s and experiences a magnetic force of (
) N. The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field. (+3.0 T)
3. A 2.0-C charge moves with a velocity of (
) m/s and experiences a magnetic force of (
) N. The x component of the magnetic field is equal to zero. Determine the z component of the magnetic field. (+5.0 T)
4. A particle (mass = 2.0 mg, charge = 6.0 C) moves in the positive direction along the x axis with a velocity of 3.0 km/s. It enters a magnetic field of (
) mT. What is the acceleration of the
2
particle? (36  27 ) m/s
5. What is the magnetic force on a 2.0-m length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 55 mT and is directed at an angle of 20 away from the wire? (1.1 N)
6. The figure shows the orientation of a rectangular loop consisting of 80 closely wrapped turns each carrying a current I. The magnetic field in the region is ( ) mT. The loop can turn about the y axis. If 
= 30, a = 0.40 m, b = 0.30 m, and I = 8.0 A, what is the magnitude of the torque exerted on the loop?
(2.7 N  m)

7. A current of 4.0 A is maintained in a single circular loop having a circumference of 80 cm. An external magnetic field of 2.0 T is directed so that the angle between the field and the plane of the loop is 20.
Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it. (0.38 N
 m)
8. The figure shows the orientation of a flat circular loop consisting of 50 closely wrapped turns each carrying a current I. The

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