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Q.

Four identical iron bars were dipped in a heap of iron filings one by one, which one of the following is the strongest magnet?


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a

a

b

b

c

c

d

d 

answer is A.

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Detailed Solution

The first bar magnet is the strongest magnet.[88]
The first bar magnet is the strongest, as it has maximum iron fillings at the magnet's ends. The more the strength of the bar magnet, the more the iron fillings are attached to it at the ends because strong magnets attract more iron fillings.
When a magnet is dipped in iron filings, the iron filings attach to the magnet's ends because the attraction is strongest at the magnet's ends. Magnet poles are the ends of a magnet. Magnetic poles are always found in pairs.
 
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