Drift velocity, Ohm's law, Kirchhoff's laws, Wheatstone bridge, potentiometer.
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Q1 · Current Electricity · EASY
A wire of resistance 12 Ω is stretched uniformly to double its original length. What is the new resistance of the wire?
Q2 · Current Electricity · HARD
A battery of emf 12 V and internal resistance 2 Ω is connected to three resistors of 4 Ω, 6 Ω, and 12 Ω in parallel. What is the terminal voltage of the battery?