Question

The magnetic flux passing through a unit area perpendicular to the field is called

• A. magnetic flux density
• B. magnetic moment
• C. magnetic pole strength
• D. electromotive force

Answer 1

The Correct Option is A

Correct answer: magnetic flux density 

Explanation:
The magnetic flux density is defined as the magnetic flux passing through a unit area perpendicular to the magnetic field. 

Mathematically: \[ B = \frac{\Phi}{A} \] where:
\( B \) = magnetic flux density (in tesla)
\( \Phi \) = magnetic flux (in weber)
\( A \) = area (in m²) 

Other options:
- Magnetic moment: relates to torque experienced by a magnet in a magnetic field.
- Magnetic pole strength: a measure of strength of a magnetic pole.
- Electromotive force (emf): the voltage generated by a source like a battery or generator. 

Hence, the correct answer is: magnetic flux density.