Question

When an iron cylinder of diameter $0.20cm$ and length $30cm$ is kept parallel to a magnetic field of intensity $4800A/m$ the cylinder acquires a pole strength of $9Am$. Find the permeability of the material of the rod?

• A. $0.075222\times {10}^{-4}H/m$
• B. $9.522\times {10}^{-4}H/m$
• C. $75.22\times {10}^{-4}H/m$
• D. $7.522\times {10}^{-4}H/m$

Answer 1

The correct option is D $7.522\times {10}^{-4}H/m$

Pole Strength = m=9A*m
B =
Therefore,



=
Hence, Option D is correct.