Question

A specimen of iron of permeability $8\times {10}^{-}3$ Weber/A m is placed in a magnetic field of strength 160 A/m. Magnetic induction in this iron is:

• A. $0.8Wb/m^2$
• B. $5\times {10}^{5}Wb/m^2$
• C. $1.28Wb/m^2$
• D. $20\times Wb/m^2$

Answer 1

The correct option is C $1.28Wb/m^2$

Given that,

Permeability of iron $\mu =8\times {10}^{-3}wb/Am$

Magnetic field strength $H=160A/m$

We know that,

$\mu =\frac{B}{H}$

$B=\mu \times H$

$B=8\times {10}^{-3}\times 160$

$B=1.28wb/m^2$

Hence, the magnetic induction is $1.28wb/m^2$