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Magnetism And Matter

Question
CBSEENPH12047801
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A frog can be levitated in magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as

  • paramagnetic

  • diamagnetic

  • ferromagnetic

  • anti-ferromagnetic

Solution

B.

diamagnetic

Some substances when placed in a magnetic field are feebly magnetized in the opposite direction of the magnetizing field. Thes substances when brought close to a pole of a powerful magnet are repelled away from the magnet. The body of the frog behaves like a diamagnetic substance, hence the smallest magnetic field placed below the body of the frog will be strong enough to lift it.

When diamagnetic substances are placed in a magnetic field, then they are feebly repelled in the field.

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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?

Answer the following question:
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?

Answer the following question:
The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?

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