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qUESTIONS

If a wire is stretched to make it 0.1% longer, its resistance will [2011]

A material ‘B’ has twice the specific resistance of ‘A’. A circular wire made of ‘B’ has twice the diameter of a wire made of ‘A’. Then for the two wires to have the same resistance, the ratio lB/lA of their respective lengths must be [2006]

The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be [2018]

Consider a thin square sheet of side L and thickness t, made of a material of resistivity p. The resistance between two opposite faces, shown by the shaded areas in the figure is [2010]

In an aluminium (Al) bar of square cross section, a square hole is drilled and is filled with iron (Fe) as shown in the figure. The electrical resistivities of Al and Fe are 2.7×10^-8 Ωm and 1.0×10^-7 Ωm, respectively. The electrical resistance between the two faces P and Q of the composite bar is [2015]

By increasing the temperature, the specific resistance of a conductor and a semiconductor [2002]

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of [2003]

The resistance of a conductor is 5 ohm at 50°C and 6 ohm at 100°C. Its resistance at 0°C is [2002]

Two conductors have the same resistance at 0°C but their temperature coefficients of resistance are α₁ and α2. The respective temperature coefficients of their series and parallel combinations are nearly [2010]

In the circuit shown, the current through the 4 Ω resistor is 1 amp when the points P and M are connected to a d.c. voltage source. The potential difference between the points M and N is [2008]

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