Excited Magnetic Systems

For a toroid to extract the energy from the supply system, the flux linkages of the magnetic field must be ________

Consider a magnetic relay with linear magnetization curve in both of its open and closed position. What happens to the electrical energy input to the relay, when the armature moves slowly from open position to closed position ?

When a current of 5A flows through a coil of linear magnetic circuit, it has flux linkages of 2.4 wb-turns. What is the energy stored in the magnetic field of this coil in Joules?

The electromagnetic force and/or torque, developed in any physical system, acts in such a direction as to tend to ____________

The energy stored in a magnetic field is given by ____________ where L=self-inductance and Rl=reluctance.

For a linear electromagnetic circuit, which of the following statement is true?

The electromagnetic force developed in any physical system acts in such a direction as to tend to _____________

The electromagnetic torque developed in any physical system, and with magnetic saturation neglected, acts in such a direction as to tend to ___________

Magnetic stored energy density for iron is given by ______

Electromagnetic force and/or torque developed in any physical system, acts in such a direction as to tend to ___________