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Magnetism and Matter
Question
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What do you understand by the terms ‘magnetic length and geometric length’ of the magnet? How are the two related to each other?

Answer

The actual length of a magnet is called the geometric length of the magnet.

The distance between the poles of a magnet is called the magnetic length of the magnet.

The geometric length of the magnet is nearly 8/7 times the magnetic length of the magnet.

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Some More Questions From Magnetism and Matter Chapter

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A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth's magnetic field.

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The angle of dip at a location in southern India is about 18°. Would you expect a greater or smaller dip angle in Britain?

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In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south pole?

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Geologists claim that besides the main magnetic N-S poles, there are several local poles on the earth's surface oriented in different directions. How is such a thing possible at all?

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The earth's magnetic field varies from point to point in space. Does it also change with time? If so, on what time scale does it change appreciably?

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The earth's core is known to contain iron. Yet geologists do not regard this as a source of the earth's magnetism. Why?

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The charged currents in the outer conducting regions of the earth's core are thought to be responsible for earth's magnetism. What might be the ‘battery’ (i.e., the source of energy) to sustain these currents?

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The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth's field in such distant past?