Electric current; drift velocity; Ohm's law; electrical resistance; V-I characteristics; resistivity and conductivity; series and parallel combination of resistors; temperature dependence; internal resistance of a cell; Kirchhoff's laws and applications — Wheatstone bridge, metre bridge, potentiometer.
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Q1 · Current Electricity · EASY
A wire of resistance 12 Ω is bent in the form of an equilateral triangle. The effective resistance between any two corners of the triangle is:
Q2 · Current Electricity · MEDIUM
In a potentiometer experiment, the balancing length for a cell of emf E is 560 cm. When an external resistance of 10 Ω is connected in series with the cell, the balancing length becomes 500 cm. The internal resistance of the cell is:
Q3 · Current Electricity · MEDIUM
A wire has a resistance of 10 Ω. It is stretched uniformly to twice its original length. The resistance of the stretched wire will be:
Q4 · Current Electricity · EASY
In the circuit shown, a current of 2 A flows through the 5 Ω resistor. The current through the 10 Ω resistor is:
Q5 · Current Electricity · HARD
A Wheatstone bridge is balanced when P = 100 Ω, Q = 1000 Ω, and R = 40 Ω. If P and Q are each increased by 10 Ω, the value by which R must be changed to restore balance is: