Question: A solenoid has a length of 1 m and a cross-sectional area of 0.01 m². If the magnetic field inside it is 0.2 T, what is the magnetic flux?

Options:

1. 0.002 Wb
2. 0.01 Wb
3. 0.02 Wb
4. 0.1 Wb

Correct Answer: 0.02 Wb

Solution:

Magnetic flux (Φ) = B * A. Here, Φ = 0.2 T * 0.01 m² = 0.002 Wb.