Questions
A short bar magnet of length 1 cm has points A & B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be:
a
8
b
122
c
3
d
4
detailed solution
Correct option is A
For a short magnet at a point along its axial lineB=μ04π.2Mr3 ∴BABB=r2r13 ⇒BABB=48243=81=8 ∴ BA:BB=8:1Talk to our academic expert!
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Magnetic lines of force due to a bar magnet do not intersect because
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