PHY2044 - PHYSICS FOR ENGINEERS II
PRACTICE TEST FOR CHAPTER 26

Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 26, "The Magnetic Field". This includes questions on the force exerted by a magnetic field, motion of a charge in a magnetic field and torques on current loops and magnets. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.


Q1: A proton with a charge +e is moving with a speed v at 50° to the direction of a magnetic field B. The component of the resulting force on the proton in the direction of B is

evBsin(50°)cos(50°)
evBcos(50°)
zero
evBsin(50°)
None of the above

Q2: A positively charged particle is moving northward in a magnetic field. The magnetic force on the particle is toward the northeast. What is the direction of the magnetic field?

up
west
south
down
This situation cannot occur.

Q3: A uniform magnetic field of 200 T is directed vertically upward. The force on an electron (q = 1.6 × 10-19 C) moving horizontally northward at 2.0 × 106 m/s is approximately

4.0 × 108 N; east
24 × 108 N; west
6.4 × 10-11 N; west
6.4 × 10-11 N; east
zero

Q4: A 7Li nucleus with a charge of +3e (e = 1.6 × 10-19 C) and a mass of 11.62 × 10-27 kg and a proton with a charge of +e and a mass of 1.66 × 10-27 kg are both moving in a plane perpendicular to a magnetic field B. The two particles have the same momentum. The ratio of the radius of curvature of the path of the proton (Rp) to that of the 7Li nucleus (RLi) is

Rp/RLi = 3
Rp/RLi = 1/3
Rp/RLi = 7
Rp/RLi = 1/7
Rp/RLi = 3/7

Q5: A rectangular loop of wire (0.10 m by 0.20 m) carries a current of 5.0 A in a counterclockwise direction. The loop is oriented as shown below in a uniform magnetic field.

What is the magnetic dipole moment associated with this loop?

0.026 A.m2
0.030 A.m2
0.10 A.m2
0.50 A.m2
1.5 A.m2


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