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Asked in AIPMT 1997 · Lorentz force and work done
Idea: read the unit off the defining force law.
The magnetic force on a moving charge is F=qvB sin θ.
Rearranging: B=F/(qv sin θ), so the unit is N/(C m s⁻¹)=N A⁻¹ m⁻¹.
That combination is given the name tesla.
Magnetic flux is B times area, measured in webers, so 1 T=1 Wb m⁻² — a tesla is a flux density.
So the tesla is the unit of magnetic field.
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