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A physical quantity `u` is given by the relation `u=(B^(2))/(2mu_(0))`
Here `B=` magnetic field strength
`mu_(0)=` magnetic permeability of vacuum
The name of physical quantity `u` is
A. energy
B. energy density
C. pressure
D. none of these

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(b) `u=(B^(2))/(2mu)`
Unit of `u=((N//Am)^(2))/(N//A^(2))=(N^(2)A^(2))/(NA^(2))m^(2))=N/(m^(2))=(Nm)/(m^(3))=J/(m^(3))`
`=` energy per unit volume =energy density

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