Mumbai university > FE > SEM 1 > Applied Physics 1

Marks: 3M

Year: Dec 2013

Magnetic Circuit:-

• A closed magnetic field linked with electric circuit is called magnetic circuit.

• A magnetic circuit is made up of one or more closed loop paths containing a magnetic flux.

Ohm’s Law Analogy:-

• Ohm’s law in case of magnetic circuits can be stated as, the Magnetic flux (Φ) developed in the circuit is directly proportional to Magnetic motive force (m.m.f. = N.i).

• The relation is similar to Ohm’s law and can be formed by replacing Electro motive force (e.m.f.) with m.m.f. and Electric Current (i) with Magnetic Flux.

• The relation can be expressed as follows:-

$$ Φ =\frac{N.i}{R}$$

Where, R is called Reluctance of the circuit

$$ R =\frac{l}{μ_r μ_0 A}$$