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Eddy currents are produced when [1988]
  • a)
    a metal is kept in varying magnetic field
  • b)
    a metal is kept in steady magnetic field
  • c)
    a circular coil is placed in a magnetic field
  • d)
    through a circular coil, current is passed
Correct answer is option 'A'. Can you explain this answer?
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Eddy currents are produced when [1988]a)a metal is kept in varying mag...
Eddy currents are produced when a metal is
kept in a varying magnetic field.
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Read the following text and answer the following questions on the basis of the same: If we move into space and study the Earth's invisible magnetic field, it wouldn't really look like a bar magnet at all. Earth's magnetic field gets stretched out into a comet-like shape with a tail of magnetism that stretches millions of miles behind the earth, opposite to the Sun. The Sun has a wind of gas that pushes the earth's field from the left to the right in the picture.The core of the Earth is an electromagnet. Although the crust is solid, the core of the Earth is surrounded by a mixture of molten iron and nickle. The magnetic field of Earth is caused by currents of electricity that flow in the molten core. These currents are hundreds of miles wide and flow at thousands of miles per hour as the Earth rotates. The powerful magnetic field passes out through the core of the Earth, passes through the crust and enters space. This picture shows the solid inner core region ( inner circl e) surrounded by a molten outer core (the area between the two circles). The currents flow in the outer core, travel outwards through the rest of the earth's interior. If the Earth rotated faster, it would have a stronger magnetic field.By the time the field has reached the surface of Earth, it has weakened a lot, but it is still strong enough to keep your compass needles pointed towards one of its poles. All magnets have two poles: a North Pole and a South Pole. The magnetic poles of earth are not fixed on the surface, but wander quite a bit. The pole in the Northern Hemisphere seems to be moving northwards in geographic latitude by about 10 kilometres per year by an average.The Earth’s magnetism is due to

Read the following text and answer the following questions on the basis of the same:Earth’s magnetism: Earth’s magnetic field is caused by a dynamo effect. The effect works in the same way as a dynamo light on a bicycle. Magnets in the dynamo start spinning when the bicycle is pedaled, creating an electric current. The electricity is then used to turn on the light. This process also works in reverse. If you have a rotating electric current, it will create a magnetic field. On Earth, flowing liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet. The average magnetic field strength in the Earth's outer core was measured to be 25 Gauss, 50 times stronger than the magnetic field at the surface. The magnetic field is extremely important for sustaining life on Earth. Without it, we would be exposed to high amounts of radiation from the Sun and our atmosphere would be free to leak into space. This is likely what happened to the atmosphere on Mars. As Mars doesn’t have flowing liquid metal in its core, it doesn’t produce the same dynamo effect. This left the planet with a very weak magnetic field, allowing for its atmosphere to be stripped away by solar winds, leaving it uninhabitable. Based upon the study of lava flows throughout the world, it has been proposed that the Earth's magnetic field reverses at an average interval of approximately 300,000 years. However, the last such event occurred some 780,000 years ago.Which of the followings is the reason for Earth’s magnetism?

Eddy currents are produced when [1988]a)a metal is kept in varying magnetic fieldb)a metal is kept in steady magnetic fieldc)a circular coil is placed in a magnetic fieldd)through a circular coil, current is passedCorrect answer is option 'A'. Can you explain this answer?
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Eddy currents are produced when [1988]a)a metal is kept in varying magnetic fieldb)a metal is kept in steady magnetic fieldc)a circular coil is placed in a magnetic fieldd)through a circular coil, current is passedCorrect answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Eddy currents are produced when [1988]a)a metal is kept in varying magnetic fieldb)a metal is kept in steady magnetic fieldc)a circular coil is placed in a magnetic fieldd)through a circular coil, current is passedCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Eddy currents are produced when [1988]a)a metal is kept in varying magnetic fieldb)a metal is kept in steady magnetic fieldc)a circular coil is placed in a magnetic fieldd)through a circular coil, current is passedCorrect answer is option 'A'. Can you explain this answer?.
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