Engineering
Physics
Dimensions
Question

The dimensions of B22μ0, where B is magnetic field and μ0 is the magnetic permeability of vacuum, is

ML2T–2

ML2T–1

MLT–2

ML–1T–2

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Solution

Energy density in magnetic field =B22μ0

=Force×displacement(displacement)3=MLT−2.LL3=ML−1T−2