Take a cardboard and sprinkle some salt and iron filings on it. How will you separate these two?

Shake the cardboard

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Use a bar magnet

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Blow them

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All of the above.

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Solution

The correct option is C Use a bar magnet
When using a bar magnet the iron filings will stick onto it and will easily be separated.

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Take a cardboard and sprinkle some salt and iron filings on it. How will you separate these two?

The correct option is C Use a bar magnetWhen using a bar magnet the iron filings will stick onto it and will easily be separated.

The correct option is C Use a bar magnet
When using a bar magnet the iron filings will stick onto it and will easily be separated.