Quiz

Question bank: Unit 2 — Electricity and Magnetism

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Increasing the length of a wire of the same material and thickness:

decreases its resistance

increases its resistance

leaves the resistance unchanged

makes the resistance zero

Two wires of the same metal and the same length have cross-sectional areas A and 2A. The thicker wire has:

double the resistance

the same resistance

half the resistance

four times the resistance

A rheostat is used to:

measure voltage

change the resistance in a circuit

store charge

produce emf

Ohm's law states that, at constant temperature, the current through a conductor is:

inversely proportional to the voltage

directly proportional to the potential difference across it

independent of voltage

directly proportional to the resistance