Here τ∣τ∣=M×B=MBsin90∘ and we know that τ=Fl ∴Fl=MB⇒l=FMB 
NEET UG 2013 — Physics Electromagnetism
A bar magnet of magnetic moment M placed at right angles to a magnetic induction B. If a force F is experienced by each pole of the magnet. The length of the magnet will be:
Held on 30 Apr 2013 · Verified 9 Jul 2026.
MB/F
BF/M
MF/B
F/MB
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