A toroidal core with a mean circumference of 50 cm and a cross-sectional area of 2 cm2 is wound with 300 turns. If a current of 2.5 A flows through the coil, what is the magnetic field intensity H inside the core?

In a magnetic circuit, the Magnetomotive Force (MMF) is equal to the product of _________.

If the permeability μ of a material is increased, the reluctance of the composite magnetic circuit ___________.

An air gap is introduced into a closed magnetic circuit. What happens to the magnetic flux if the MMF remains constant?