Question

Rheostat is generally _______ in nature

• A. Metallic
• B. Non-metallic
• C. Semi-metallic
• D. Gaseous

Answer 1

The correct option is A Metallic

A rheostat is a Resistance element with considerable length. It is usually metallic in nature. The defining equation is

$R=\rho \frac{L}{A}$

Where;

$\rho$=resistivity of the element

$L$=length of the wire.

$A$= area of cross section of the wire.