Chapter 32: Problem 2859
The reciprocal of resistivity is called (A) mho-m (B) conductivity (C) retentivity (D) conductance
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If a copper wire is stretched to make it \(0.1 \%\) longer, then what is the percentage change in its resistance? (A) \(0.2 \%\) (B) \(0.3 \%\) (C) \(0.4 \%\) (D) \(0.1 \%\)
Which one of the following is not Ohm's law? \((\mathrm{J}=\) current density, \(\mathrm{E}=\) Electric field, \(\rho=\) resistivity and \(\sigma\) conductivity) (A) \(\mathrm{J}=\sigma \mathrm{E}\) (B) \(\mathrm{J}=\rho \mathrm{E}\) (C) \(\mathrm{I}=(\mathrm{V} / \mathrm{R})\) (D) \(\mathrm{E}=\rho \mathrm{J}\)
The dimensions of a conductor of specific resistance \(\rho\) are shown below: What is its resistance across \(\mathrm{CD}\). (A) \((\mathrm{pb} / \mathrm{ac})\) (B) ( \(\rho \mathrm{a} / \mathrm{bc})\) (C) \([(\rho \mathrm{ab}) / \mathrm{c}]\) (D) \((\rho c / a b)\)
The temperature coefficient of resistance of a wire is $1.25 \times 10^{-3} /{ }^{\circ} \mathrm{C}\( At \)300 \mathrm{~K}\(, its resistance is \)1 \Omega .$ What is the temperature at which its resistance becomes \(2 \Omega\) ? (A) \(827^{\circ} \mathrm{C}\) (B) \(1127^{\circ} \mathrm{C}\) (C) \(800{ }^{\circ} \mathrm{C}\) (D) \(1100^{\circ} \mathrm{C}\)
The external resistance of a circuit is \(\eta\) times higher than the internal resistance of the source. The ratio of the potential difference across the terminals of the source to its emf is (A) \([(\eta-1) / \eta]\) (B) \((1 / \eta)\) (C) \([\eta /(1+\eta)]\) (D) \(\eta\)
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