Ohm's law, drift velocity, resistance, Kirchhoff's laws, Wheatstone bridge, cells and EMF.
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Q1 · Current Electricity · MEDIUM
A wire of length 2 m and cross-sectional area 2 × 10^-6 m² has a resistance of 4 Ω. If the same wire is stretched uniformly to a length of 4 m, what will be its new resistance?
Q2 · Current Electricity · EASY
In a circuit, three resistors of resistances 2 Ω, 3 Ω and 6 Ω are connected in parallel. What is the equivalent resistance of the combination?
Q3 · Current Electricity · EASY
A Wheatstone bridge is balanced when the resistances in the four arms are 10 Ω, 20 Ω, 30 Ω and R respectively. What is the value of R?
Q4 · Current Electricity · MEDIUM
A cell of EMF 6 V and internal resistance 2 Ω is connected to an external resistor of 4 Ω. A high-resistance voltmeter is connected across the external resistor. What will be the reading of the voltmeter?
Q5 · Current Electricity · EASY
A wire of resistance 12 Ω is stretched uniformly to twice its original length. What is the new resistance of the wire?