Question

An iron rod of cross-sectional area 6 sq. cm is placed with its length parallel to a magnetic field of intensity 1200 Alm. The flux through the rod is 60 x 10^-4 Wb. The permeability of the rod is ______.

Options

• 8.3 x 10^-5 Wb/Am 

• 8.3 x 10^-4 Wb/Am 

• 8.3 x 10^-6 Wb/Am

• 8.3 x 10^-3 Wb/Am

Answer 1

An iron rod of cross-sectional area 6 sq. cm is placed with its length parallel to a magnetic field of intensity 1200 Alm. The flux through the rod is 60 x 10^-4 Wb. The permeability of the rod is 8.3 x 10^-3 Wb/Am.

Explanation:

B = µM_z    Also, B = ${\displaystyle \frac{\varphi }{\text{A}}}$

∴ µ = ${\displaystyle \frac{\text{B}}{{\text{M}}_{\text{z}}}}$

∴ µ = ${\displaystyle \frac{60\times {10}^{-4}}{6\times {10}^{-4}\times 1200}=8.3\times {10}^{-3}}$ Wb/Am