Question

Which of the following area has a maximum magnetic flux density? (Assume both areas $A$ and $B$ to be equal)

• A. $B$
• B. $A$
• C. $A$ = $B$
• D. Cannot be determined

Answer 1

The correct option is B $A$

The number of magnetic field lines passing normal through a unit area is called magnetic flux density. For area $A$, total 7 field lines are passing normal to it. Through area $B$, only 3 lines are passing. Hence, magnetic flux density is maximum at $A$.