Electromagnetic separation is used for :

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when ore is non-magnetic and impurity is magnetic

when ore is magnetic and impurity is non

both (a) and (b)

none of the above

answer is C.

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Detailed Solution

Electromagnetic separation is used for

(a) when an ore is non-magnetic and impurity is magnetic

(b) when an ore is magnetic and impurity is nonmagnetic

Electromagnetic separation is used to separate materials if either the ore or the gangue is drawn to the magnetic field. For instance, since a magnet attracts iron ores, it is possible to use magnetic separation to extract non-magnetic impurities from them.

Magnetic forces do not draw the impurities. Or to put it another way, impurity is not magnetic by nature.

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