PHY2044 - PHYSICS FOR ENGINEERS II
PRACTICE TEST FOR CHAPTER 27

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 27, "Sources of the Magnetic Field". This includes questions on the magnetic field due to moving charges and currents, the Biot-Savart Law and Ampère's Law. 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 1000 turn solenoid is 50 cm long and has a radius of 2.0 cm. It carries a current of 8.0 A. What is the magnetic field inside the solenoid near its center?

2.0 × 10-2 T
3.2 × 10-3 T
4.0 × 10-4 T
1.0 T
2.0 × 10-4 T

Q2: Two very long, parallel conducting wires carry equal currents in the same direction, as shown. The numbered diagrams below show end views of the wires and the resultant force vectors due to current flow in each wire. Which diagram best represents the direction of the forces?



1
2
3
4
5


Q3: Two very long, parallel conducting wires carry equal currents in the same direction, as shown. The numbered diagrams below show end views of the wires and the resultant force vectors due to current flow in each wire. Which diagram best represents the direction of the forces?



1
2
3
4
5


Q4: A wire of radius 0.35 cm carries a current of 75 A that is uniformly distributed over its cross-sectional area. The magnetic field at a distance 5.0 cm from the center of the wire is approximately

0.47 mT
1.5 mT
0.30 mT
0.56 mT
0.24 mT

Q5: The tightly wound toroid shown below consists of 100 turns of wire, each carrying a current I = 3 A.

If the inner radius a = 12 cm and the outer radius b = 15 cm, the magnetic field at a radius r = 13 cm, due to the current in this toroid, is

333 μT
462 μT
533 μT
620 μT
zero


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