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Q.

Two short magnets each moment 10Am2  are placed in end- on position so that their  centres are 0.1m apart. The force between them is

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a

0.4 N

b

0.5 N

c

0.6 N

d

0.8 N

answer is C.

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Detailed Solution

When magnets are along the line joining their centres is                                   F=μ04π6M1M2r4 ⇒F=4π×10-74π6×10210-4=0.6N
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