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Question

# The length of a magnet is 16 cm. Its pole strength is 250 mAâˆ’m When it is cut into four equal pieces parallel to its axis, the magnetic length, pole strength and moments of each piece are :

A
4 cm; 62.5 mAm; 250 mAcm2
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B
8 cm ; 500 mAm; 400 mAcm2
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C
16 cm; 250 mAm; 4000 mAcm2
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D
16 cm; 62.5 mAm; 0.01Am2
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Solution

## The correct option is B 16 cm; 62.5 mA−m; 0.01Am2On cutting the magnet parallel to its axis, the magnetic length remains same.Pole strength decreases by a factor of 4 as it is divided into four partsmfinal=250/4=62.5 mA−m.Mfinal=mL=16×10−2×62.5×10−3=0.01 Am2

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