Question

A flux 1.2 mWb exerts in a magnet having a cross-section of 30 cm². The flux density in tesla is
1. 4
2. 0.4
3. 2.5
4. 40

Answer 1

Correct Answer - Option 2 : 0.4

Concept:

The flux density in Tesla is given as:

\(\frac{Flux ~in ~Wb}{Area ~in~m^2}\)

Analysis:

Given:

Flux = 1.2 mWb = 1.2 × 10^-3 Wb

Area = 30 cm² = 30 × 10^-4 m²

∴ The flux density is calculated as:

Flux density = \(\frac{ 1.2 × 10^{-3}}{30 × 10^{-4}} = 0.4\) T