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Electricity & Magnetism

Current electricity, magnetic effects.

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Q1 · Electricity & Magnetism · EASY
A wire of resistance 10 ohm is connected across a battery of 5 V. What is the current flowing through the wire?
Q2 · Electricity & Magnetism · MEDIUM
Two resistors of 4 ohm and 6 ohm are connected in parallel. What is the equivalent resistance of the combination?
Q3 · Electricity & Magnetism · MEDIUM
A magnetic compass is placed near a current-carrying wire. When the direction of current in the wire is reversed, what happens to the deflection of the compass needle?
Q4 · Electricity & Magnetism · HARD
An electric heater of resistance 50 ohm is connected to a 220 V supply for 2 hours. Calculate the electrical energy consumed in kilowatt-hour (kWh).
Q5 · Electricity & Magnetism · MEDIUM
A wire of resistance 12 Ω is cut into three equal parts. These parts are then connected in parallel. What is the equivalent resistance of the combination?