The resistivity of all pure metals increases with increase in temperature.
The resistivity of all pure metals increases with increase in temperature.
True
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$(a)$ Resistivity of iron is $10 \times 10^{-8} \;\Omega m$ and of mercury is $94 \times 10^{-8}\; \Omega m$. Which among iron and mercury is a better conductor ? Give reason.
$(b)$ Resistivity of a material $A$ is in the range of $10^{10}-10^{\text {14 }} \;\Omega m$ while that of $B$ is in the range of $10^{-6}-10^{-8} \;\Omega$ m. Which of the two will behave as an insulator and why?
$(a)$ Resistivity of iron is $10 \times 10^{-8} \;\Omega m$ and of mercury is $94 \times 10^{-8}\; \Omega m$. Which among iron and mercury is a better conductor ? Give reason.
$(b)$ Resistivity of a material $A$ is in the range of $10^{10}-10^{\text {14 }} \;\Omega m$ while that of $B$ is in the range of $10^{-6}-10^{-8} \;\Omega$ m. Which of the two will behave as an insulator and why?
Three bulbs of $40\, W , 60\, W$ and $100\, W$ are connected in series across the mains. Across which the potential difference is highest? Across which is lowest ?
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Three $2 \,\Omega$ resistors, $A, B$ and $C,$ are connected as shown in figure. Each of them dissipates energy and can withstand a maximum power of $18 \,W$ without melting. Find the maximum current that can flow through the three resistors.
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