A short bar magnet of magnetic
moment 3 2 12.8 10 Am
is arranged in
the magnetic meridian with its south
pole pointing geographic north. If
BH
=0.4 gauss, the distance between
the null points is
1) 4 cm 2) 8cm
3)12 cm 4) 16cm
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don't know sorry ...... ..... . ....
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