A series magnetic circuit will have

• A. Different magnetic flux
• B. Same magnetic flux
• C. Two or more paths for magnetic flux
• D. Total reluctance of a series circuit = difference of the reluctances in different parts of the circuit

Answer: (B)

In the same way that we can have series, parallel or series-parallel electric circuits, we can also have equivalent series and series-parallel (but not parallel) magnetic circuits.
In practice, a magnetic circuit may consist of several parts in a series of different lengths, cross-sectional areas, and permeabilities. In such a series magnetic circuits, all the reluctances of several parts will get summed up together (as resistors in an electric circuit) to form the net reluctance of the circuit.
In series magnetic circuits the flux passing through each part will be the same (as current in the series electric circuits).