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Q.

Soft iron pieces are placed across the ends of the bar magnets when stored. Such pieces are called?


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a

Preservatives

b

keepers

c

Compass

d

Poles 

answer is B.

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Detailed Solution

When soft iron particles are held over the ends of bar magnets, they are referred to as magnetic holders. When two magnets are placed next to each other, they repel or attract each other, reducing the magnetic force. The magnets are therefore placed next to each other, with opposite poles close together.
Preservatives are chemicals that are often used to preserve objects with a chemical background. However, because iron is highly reactive to chemicals, it cannot be used as a preservative. So preservative is not the right answer.
 
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