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The resistance of a bulb filament is $100 \Omega$ at a temperature of $100^{\circ} \mathrm{C}$. If its temperature coefficient of resistance be $0.005$ per ${ }^{\circ} \mathrm{C}$, its resistance will become $200 \Omega$ at a temperature of
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The correct answer is:
$300^{\circ} \mathrm{C}$
$300^{\circ} \mathrm{C}$
$200=100[1+(0.005 \times \Delta t)]$
$T-100=200$
$\mathrm{T}=300^{\circ} \mathrm{C}$
$T-100=200$
$\mathrm{T}=300^{\circ} \mathrm{C}$
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