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Does a bar magnet exert a torque on itself due to its own field? Does one element of a current-carrying wire exert a force on another element of the same

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Magnetic field arises due to charges in motion. Can a system have magnetic moments even though its net charge is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions regarding earth’s magnetism: A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions regarding earth’s magnetism: The angle of dip at a location in southern India is about 18°. Would you expect a greater or smaller dip angle in

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions regarding earth’s magnetism: If you made a map of magnetic field lines at Melbourne in Australia, would the lines seem to go into the ground or come out of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions regarding earth’s magnetism: In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions regarding earth’s magnetism: The earth’s field, it is claimed, roughly approximates the field due to a dipole of magnetic moment 8 × 1022 J T–1 located at its centre. Check the order of magnitude of this number in some

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions regarding earth’s magnetism: 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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions: 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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions: The earth’s core is known to contain iron. Yet geologists do not regard this as a source of the earth’s magnetism.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions: 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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions: 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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions: 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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions: Interstellar space has an extremely weak magnetic field of the order of 10–12 T. Can such a weak field be of any significant consequence? Explain. [Note: Exercise 2 is meant mainly to arouse your curiosity. Answers to some questions above are tentative or unknown. Brief

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A short bar magnet placed with its axis at 30° with a uniform external magnetic field of 0.25 T experiences a torque of magnitude equal to 4.5 × 10–2 J. What is the magnitude of magnetic moment of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A short bar magnet of magnetic moment m = 0.32 JT–1 is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, which orientation would correspond to its

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A short bar magnet of magnetic moment m = 0.32 JT–1 is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, which orientation would correspond to its unstable equilibrium? What is the potential energy of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when

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Why is diamagnetism, in contrast, almost independent of

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If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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