In a coil, the current changes from \( -2 \, \text{A} \) to \( +2 \, \text{A} \) in \( 0.2 \, \text{s} \) and induces an emf of \( 0.1 \, \text{V} \). The self-inductance of the coil is:
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To calculate self-inductance, ensure accurate substitution of the total current change and time interval. The relationship \( L = \frac{\mathcal{E} \cdot \Delta t}{\Delta I} \) directly links the rate of current change to the induced emf.