Explanation

Instantaneous power in an inductor is given by p = vi = Li di/dt, so it depends on current and its rate of change.

This shows energy is stored in (or released from) the magnetic field, not dissipated as heat.

Explanation

The fundamental theorem of network topology states that the number of branches equals the sum of independent loops and nodes minus one.

This relation is essential for applying Kirchhoff’s laws in electrical network analysis.

Explanation

Large induction motors are designed with low slip to achieve high efficiency and better speed regulation.

From no-load to full-load, their slip typically increases only slightly, remaining around 1.5–2%.

Explanation

Gas viscosity rises with temperature because gas molecules move faster and collide more frequently.

This behavior is opposite to liquids, where viscosity usually decreases with temperature.

Explanation

Hertz (Hz) is the SI unit of frequency, representing one complete cycle per second.

Frequency measures how often a repeating event occurs in one second.

Explanation

- Resistivity (ρ) is a measure of how strongly a material opposes the flow of electric current.

- The reciprocal of resistivity is called conductivity (σ).

Mathematically:  

σ = 1 / ρ

- Conductivity indicates how easily a material allows the flow of electric current.

- The other options:  

  - Impedance relates to resistance and reactance in AC circuits.  

  - Admittance is the reciprocal of impedance.  

  - Resistance is the opposition to current flow but depends on dimensions, unlike resistivity.

Explanation

Percentage elongation measures how much a material stretches before breaking under tensile load.

Higher elongation indicates greater ability to deform plastically without fracture.

Percentage elongation is a direct measure of ductility.

Explanation

Steel is more elastic than rubber because the ratio of stress to strain is more for steel.

This indicates that steel deforms less under the same amount of stress compared to rubber, making it more elastic.

Explanation

Permissible error defines the tolerance allowed in a measurement.

Ensures accuracy and reliability in engineering measurements.

Permissible error = allowed deviation from true value.

Explanation

Thermal diffusivity indicates how quickly heat spreads through a material.

It depends on thermal conductivity, density, and specific heat of the material.

Thermal diffusivity is an intrinsic physical property of a material.