Ohm's law, Kirchhoff's laws, Wheatstone bridge, potentiometer, drift velocity.
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Q1 · Current Electricity (Class 12) · MEDIUM
A wire of resistance 12 Ω is bent to form a square loop. A battery of emf 6 V and negligible internal resistance is connected across one of its diagonals. The current drawn from the battery is:
Q2 · Current Electricity (Class 12) · MEDIUM
In a potentiometer experiment, the balancing length for a cell of emf 1.5 V is 75 cm. If the balancing length becomes 60 cm when a resistance of 5 Ω is connected across the cell, then the internal resistance of the cell is:
Q3 · Current Electricity (Class 12) · EASY
A uniform wire of resistance 36 Ω is cut into three equal parts and then connected in parallel. The equivalent resistance of the combination is:
Q4 · Current Electricity (Class 12) · MEDIUM
A potentiometer wire of length 5 m and resistance 10 Ω is connected to a 3 V battery. A cell of emf 1.5 V gives null deflection at 2.5 m. The internal resistance of the cell if it is shunted by 5 Ω resistance and null point shifts to 2.0 m is
Q5 · Current Electricity (Class 12) · EASY
A galvanometer of resistance 50 Ω gives full scale deflection for a current of 0.002 A. The value of shunt resistance required to convert it into an ammeter of range 0.1 A is