The energy density in magnetic field B is proportional to

A current i in a circular loop of radius b produces a magnetic field. At a fixed point fur from the loop on its axis the magnetic field is proportional to which of the following combinations of i and b ?

Energy density in the electric field of electromagnetic wave is U.If amplitude of electric field (E_0) and magnetic field (B_0) is related as E_0 = c B_0 , then energy density in magnetic field is(c = speed of light)

Energy density in the electric field of electromagnetic wave is U.If amplitude of electric field (E_0) and magnetic field (B_0) is related as E_0 = c B_0 , then energy density in magnetic field is(c = speed of light)

Which of the following is proportional to energy density in magnetic field B:

Which of the following is proportional to energy density in magnetic field B: