PHY2044 - PHYSICS FOR ENGINEERS II
PRACTICE TEST FOR CHAPTER 28

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 28, "Magnetic Induction". This includes questions on magnetic flux, induced emf's and Faraday's Law, Lenz's Law, motional emf, inductance and R-L circuits. 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 rectangular surface of area 1.0 m2 is hinged along the z-axis and makes an angle of 37° with the y-z plane, as shown below.

If there is a uniform magnetic field of 10 T in the positive x-direction, what is the magnetic flux through this surface?

6.0 Wb
8.0 Wb
10 Wb
13 Wb
17 Wb


Q2: The plane of a circular, 200 turn coil of radius 5.25 cm is perpendicular to a uniform magnetic field produced by a large electromagnet. This field is changed at a steady rate from 0.650 T to 0.150 T in 0.0100 s. What is the magnitude of the emf induced in the coil?

110 V
170 V
1.7 V
26 V
87 V

Q3: The figure shows a uniform, 3.0 T magnetic field that is normal to the plane of a conducting, circular loop with a resistance of 1.5 ohm and a radius of 0.024 m. The magnetic field is directed out of the paper as shown. (Assume that the area of the non-circular portion of the circuit is negligible.)

If the magnetic field is held constant at 3.0 T and the loop is pulled out of the region that contains the field in 0.2 s, what is the magnitude of the average induced emf in the loop?

8.6 × 10-3 V
9.8 × 10-3 V
2.7 × 10-2 V
5.4 × 10-2 V
6.4 × 10-2 V


Q4: A long, straight wire is in the same plane as a wooden, non-conducting loop. The wire carries an increasing current I in the direction shown in the figure.



There will be no induced emf.
There will be a counterclockwise induced emf, but no induced current.
There will be a clockwise induced emf, but no induced current.
There will be an induced current which is clockwise around the loop.
There will be an induced current which is counterclockwise around the loop.


Q5: A single conducting loop with an area of 2.0 m2 rotates in a uniform magnetic field so that the induced emf has a sinusoidal time dependence as shown.

What is the period of the induced current?

1.25 s
2.50 s
3.75 s
5.00 s
6.25 s


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