Question

An $8\Omega$ resistance wire is doubled up by folding. What is the new resistance of the wire?

• A. $0.5\Omega$
• B. $1.5\Omega$
• C. $2\Omega$
• D. $4\Omega$

Answer 1

The correct option is C $2\Omega$

Resistance of the conductor depends on the following factors:

1. Length of the conductor

2. Area of the cross-section of the conductor

3. Material used as a conductor.

Resistance is directly proportional to the length of the wire, and inversely proportional to the cross sectional area of the wire.

$R=\rho \frac{L}{A}$ where R is resistance, $\rho$ is the material's resistance in ohms, $l$ is the length, and $A$ is the cross sectional area in $m^2$.