Some iron fillings are mixed with sand. We can separate them using magnetic separation method. This method is applicable only when:

magnetic substances are mixed up with non-magnetic substances

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magnetic substances are mixed up with magnetic substances

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magnetic substances are heated beyond their Curie temperatures

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two magnetic substances have equal melting points

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Solution

The correct option is A magnetic substances are mixed up with non-magnetic substances
In a mixture of two materials if one have magnetic properties then that material is easily separate by magnet because that material attracted by magnet and other material is not attracted by magnet.
If both material have magnetic property or both haven't magnetic property then above method doesn't works.

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Q. Some iron fillings are mixed with sand. We can separate them using magnetic separation method. This method is applicable only when:

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