Electricity & Magnetism MCQs with Answers

One-liner

The minimum change on any object cannot be less than 1.6 × 10⁻¹⁹ C, which is the charge of a single electron (elementary charge).

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For metals, the temperature coefficient of resistance is positive, meaning their resistance increases with rising temperature.

One-liner

Ebonite is an insulator commonly used in electrical applications due to its high electrical resistance.

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When a soap bubble is charged, its size decreases because the like charges repel each other, increasing surface tension and compressing the bubble.

One-liner

The range of Coulomb's force is infinite, meaning it theoretically extends to any distance, though its strength decreases with the square of the distance.

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Atoms in conductors are held together by a metallic bond, where electrons are delocalized and free to move, enabling electrical conductivity.

One-liner

A fuse wire is used to prevent damage due to unusually high voltage by melting and breaking the circuit when excessive current flows.

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The continuous flow of electrons is made possible by a device called the filament.

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The torque on an electric dipole in a uniform electric field is perpendicular to both the field and the dipole moment.

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The resistance of a material depends on length, cross-sectional area, and temperature, but pressure exerted by material on a smooth surface is not a factor affecting electrical resistance.