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Q.

If a bar magnet of pole strength 'm' and magnetic moment 'M' is cut equally 5 parts parallel to its axis and 4 parts perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively

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a

m20, M20

b

m4, M20

c

m5, M20

d

m5, M4

answer is C.

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Detailed Solution

(∵M = 2lm, M' = 2l ' m')five parts m'=m5 (parallel)Four parts 2l'=2l4 (perpendicular) ;M'=m52l4 M'=M20
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