How that driving torque in a moving iron instrument is given by \(\theta = \frac{1}{2K}i^2\frac{\text{d}L}{\text{d}\theta}\) . Where the symbols have their usual meaning.

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Let ‘\(\theta\)’ be the deflection corresponding to a current of ‘I’ amp

Let the current increases by di, the corresponding deflection is ‘\(\theta+d\theta\)’

There is change in inductance since the position of moving iron change w.r.t the fixed electromagnets.

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