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Formation of Natural Magnets

When strikes ...

Question

When ___ strikes at a piece of iron ore, a permanent magnet is formed.

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Solution

When lightning strikes at a piece of iron ore, a permanent magnet is formed. Lightning is a flash of electricity produced in the sky during storms or heavy rain. Electricity is responsible for the creation of a permanent magnet.

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When lightning strikes at a piece of iron ore, a permanent magnet can be formed.

___ strikes with iron ore to form a permanent magnet.

Q. Whenstrikes at a piece of iron ore, a permanent magnet is formed.

Q. Fill in the blanks with the appropriate word.
(a) If a bar magnet is hung by a thread tied at its centre, its north pole becomes steady in the direction of the ................ Pole of the earth.
(South, north, east, west)
(b) If a bar magnet is cut into equal pieces by cutting it at right angles to its axis at two places, ........... bar magnets are formed, and a total of ................ poles are formed.
(6,3,2)
(c) There is repulsion between the .......... poles of a magnet, and attraction between its ............ poles.
(opposite, like.)
(d) When magnetic material is taken close to a magnet, the material acquires ............... .
(permanent magnetism, induced magnetism)
(e) If a magnet attracts a piece of metal, that piece must be made of ............. .
(any other metal but iron, magnetic material or iron, non-magnetic material)
(f) A magnet remains steady in a .............. direction.
(east-west, north-south)

Q. Why permanent magnets are kept with soft iron pieces at ends as keepers ?

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