First slide

Magnetisation and magnetic intensity

Question

A rod of ferromegnetic material with dimensions 10cm × 0.5cm × 2cm is placed in a magnetising field of intensity 2 ×10⁵A/m. The magnetic moment produced due it is 6 amp–m². The value of magnetic induction will be ----- 10^–2T.

Difficult

Solution

$\begin{array}{rcl} B & = & μ_{0} (H + I); \\ I & = & \frac{M}{V} = \frac{6}{10 x 10^{- 6}} = 0.6 x 10^{6} A / m \\ B & = & 4 π x 10^{- 7} (2 x 10^{5} + 6 x 10^{5}) = 100.5 x 10^{- 2} T \end{array}$

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