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Class 12 Exam  >  Class 12 Questions  >  Which of the following is a natural magnet?a)... Start Learning for Free
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Which of the following is a natural magnet?
  • a)
    Magnetic needle
  • b)
    Magnetite
  • c)
    Bar magnet
  • d)
    Horseshoe magnet
Correct answer is option 'B'. Can you explain this answer?
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Which of the following is a natural magnet?a)Magnetic needleb)Magnetit...
Explanation:


Magnetism is a phenomenon in which certain materials exhibit an attractive or repulsive force. There are two types of magnets, natural magnets and artificial magnets. Natural magnets are naturally occurring materials that exhibit magnetism, while artificial magnets are materials that are magnetized through external means, such as exposure to a magnetic field or electric current.

Natural Magnet:


Magnetite is a natural magnet. It is an iron oxide mineral that is found in igneous, metamorphic, and sedimentary rocks. Magnetite is a naturally occurring material that exhibits magnetism. It is the most magnetic of all the naturally occurring minerals on Earth. Magnetite is black or brownish-black in color, with a metallic luster and a hardness of 5.5-6.5 on the Mohs scale.

Artificial Magnets:


Artificial magnets are materials that are magnetized through external means. Some examples of artificial magnets include:

- Bar magnets: a rectangular or cylindrical magnet with north and south poles at opposite ends
- Horseshoe magnets: a U-shaped magnet with north and south poles at opposite ends
- Electromagnets: a magnet created by passing an electric current through a coil of wire

Conclusion:


In conclusion, Magnetite is a naturally occurring material that exhibits magnetism and is therefore a natural magnet. The other options, magnetic needle, bar magnet, and horseshoe magnet are all examples of artificial magnets.
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Which of the following is a natural magnet?a)Magnetic needleb)Magnetit...
No, this is a false statement. The power of a convex lens is positive as a convex lens has a positive focal length, while the power of a concave lens is negative as a concave lens has a negative focal length.
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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.Earth’s magnetic field has a

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.Core of the Earth is

Which of the following is a natural magnet?a)Magnetic needleb)Magnetitec)Bar magnetd)Horseshoe magnetCorrect answer is option 'B'. Can you explain this answer?
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