Question

What is the SI unit of magnetic flux?

Hint:

This unit equals tesla multiplied by square metre and is linked to Faraday's law of induction.

Answer 1

Step 1: Magnetic flux measures the total amount of magnetic field passing through a given surface area.

Step 2: It is calculated as \( \Phi = B \cdot A \cdot \cos\theta \), where \( B \) is the magnetic field strength, \( A \) is the area, and \( \theta \) is the angle between the field and the normal to the surface.

Step 3: Since \( B \) is measured in tesla and \( A \) is measured in square metres, magnetic flux comes out in tesla times square metre, and this combined unit has been given its own name, the weber, symbol Wb.

Step 4: One weber is defined as the flux that, decreasing steadily to zero in one second, induces an electromotive force of one volt in a coil of one turn linked with it. This links the weber to Faraday's law of electromagnetic induction.

Answer: The SI unit of magnetic flux is the weber (Wb).