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Magnetism - Form 2 Physics Questions and Answers
Explain how hammering demagnetizes a magnet.
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1.
Give a reason why attraction in magnetism is not regarded as a reliable method of testing for polarity.
2.
Given a bar magnet, an iron bar and a string (i) Describe a simple experiment to distinguish between the magnet and the iron bar. (ii) State with reasons the observations that would be made in the experiment.
3.
Distinguish between soft and hard magnetic materials.
4.
Explain how hammering demagnetizes a magnet.
5.
How can it be shown that the strength of a magnet is concentrated at the poles?
6.
Figure 6 shows a soft iron placed between poles of two magnets. Sketch the magnetic field pattern.
7.
Figure 8 shows a bar of soft iron placed near a magnet. On the same diagram, sketch the magnetic field pattern due to the set up.
8.
Figure 7 shows the poles of two magnets close together. Sketch the magnetic field pattern in the space between the poles.
9.
In the set up in Figure 17, the metal rod is made up of steel and iron pieces joined end to end. You are provided with two iron nails. Explain how you would use two nails provided to determine which side is iron.
10.
Figure 1 shows two bar magnets placed with the south poles close together. Sketch the magnetic field pattern between the two south poles.
11.
Figure 2 shows a horse – shoe magnet whose poles are labeled and two other magnets near it. Iron nails are attracted to the lower ends of the magnets as shown. Identify the poles marked X and Y.
12.
An un-magnetized steel rod is clamped facing North– South direction and then hammered repeatedly for some time. When tested, it is found to be magnetized. Explain this observation.
13.
One method of producing a weak magnet is to hold a steel rod in the North South direction and then hammer it continuously for some time. Using the domain theory of magnetism, explain how this method works.
14.
State the reason why the magnetic field strength of a magnetic is greatest at the poles.
15.
Figure 4 shows the magnetic field pattern around two bar magnets placed side by side. Indicate on the diagram the poles of each magnet.
16.
Figure 2 shows a soft iron bar AB placed in a coil near a freely suspended magnet. Explain the observation made when the switch is closed.
17.
In a laboratory there are four metals – tin, nickel, copper and cobalt. Of these materials, name the metals that are: (a) Magnetic (b) Non-magnetic
18.
Figure 1 shows a bar magnet AB suspended by a string. When the North Pole of another magnet is brought close to end A, there is repulsion. State the polarity of end B.
19.
State two properties of magnetic field lines around a bar magnet.
20.
(a) Describe how a magnet can be demagnetized using the electrical method (b) You are provided with two iron bars, P and Q. one of the bars is magnetized while the other is not. Explain how the magnetized bar can be identified without using a magnet or magnetic material.
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