Drift velocity, Ohm's law, resistivity, temperature dependence, Kirchhoff's laws, Wheatstone bridge, potentiometer, internal resistance.
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Q1 · Current Electricity · EASY
A wire of resistance 10 Ω is stretched to double its length. What is its new resistance, assuming the volume remains constant?
Q2 · Current Electricity · MEDIUM
Three resistors of 2 Ω, 3 Ω and 6 Ω are connected in parallel. What is the equivalent resistance of the combination?
Q3 · Current Electricity · HARD
A potentiometer wire of length 100 cm has a resistance of 10 Ω. It is connected in series with a resistance of 40 Ω and a cell of emf 2 V. The potential gradient along the wire is:
Q4 · Current Electricity · EASY
The device used to measure electric current in a circuit is: