The energy density of magnetic field in a magnetic circuit is
(A) inversely proportional to magnetic flux density
(B) directly proportional to the absolute permeability
(C) directly proportional to the magnetic flux density
(D) directly proportional to the square of magnetic flux density
(A) inversely proportional to magnetic flux density
(B) directly proportional to the absolute permeability
(C) directly proportional to the magnetic flux density
(D) directly proportional to the square of magnetic flux density