Magnetic Circuits Short Mcq Questions Answers

**Magnetic Circuits Important Terms**
1.

**Magnetomotive Force (m.m.f):**It is magnetic pressure which sets up or tends to set up flux in a magnetic circuit. When electric current is passed through a winding wound on a core, a magnetic field is produced in the core. The product of current and number of turns of the coil is equal to m.m.f.
m.m.f = N I Ampere-turns (AT)

Adding turns of wire to a coil has the same effect as increasing the current flow. For Example, a one-turn coil with 1 A of current flowing in it produces the same m.m.f as a 10-turn coil with only 0.1 A of current flow. Therefore, effective m.m.f. of a magnetic circuit is equal to the product of the number of turns and current.