Figure shows three similar lamps $L_1, L_2$ and $L_3$ connected across a power supply. If the lamp $L_3$ fuses, how will the light emitted by $L_1$ and $L_2$ change ?
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Initially $\quad \mathrm{i}_{1}=\frac{\mathrm{E}}{\mathrm{R}+\frac{\mathrm{R}}{2}}=\frac{2 \mathrm{E}}{3 \mathrm{R}}$

when $L_{3}$ is fused

$\mathrm{I}_{1}^{\prime}=\frac{\mathrm{E}}{2 \mathrm{R}}<\mathrm{i}_{1}$

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