Question

Condition for linear magnetization is______

(a) φ α If

(b) φ α Ia

(c) φ α 1/If

(d) φ α 1/Ia

The question was posed to me in an international level competition.

I need to ask this question from Electromagnetic Power and Circuit Models in portion Circuit Model, Emf and Torque of DC Machines

Answer 1

Right choice is (a) φ α If

Best explanation: For a linear magnestization to take place, flux produced by the current flowing through particaluar flux producing coil must vay in direct proportion. Here, φ is produced due to field winding which carried current If.