Ohm's law, drift velocity, Kirchhoff's laws, Wheatstone bridge, potentiometer and meter bridge.
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Q1 · Current Electricity · MEDIUM
A wire of resistance 10 Ω is stretched to twice its original length while keeping its volume constant. What is the new resistance of the wire?
Q2 · Current Electricity · MEDIUM
In a potentiometer experiment, the null point is obtained at length 60 cm when a cell of emf 1.5 V is balanced. If a standard cell of emf 1.018 V is used, at what length will the null point be obtained?
Q3 · Current Electricity · EASY
A wire of resistance R is stretched uniformly to twice its original length. What is its new resistance?
Q4 · Current Electricity · EASY
In a potentiometer experiment, the null point is obtained at a length of 60 cm when a standard cell of emf 1.02 V is used. When an unknown cell is used, the null point is at 75 cm. What is the emf of the unknown cell?
Q5 · Current Electricity · EASY
A wire of resistance R is stretched uniformly to twice its original length. Assuming the volume remains constant, what is the new resistance of the wire?