Wires of copper. silver. nichrome and glass axe made having similar length and diameter. Which will have the highest resistance?

Correct option is A

R=ρLAR = \rho \frac{L}{A}$$R=ρ\frac{L} {A} ​$$​​

where:

• $\rho$ is the resistivity of the material,
• $L$ is the length,
• $A$ is the cross-sectional area.

Among the given materials:

• Glass is an insulator and has extremely high resistivity, leading to the highest resistance.
• Nichrome has higher resistivity than metals like copper and silver but much lower than glass.
• Copper and Silver are excellent conductors with very low resistivity, so they have the lowest resistance.

• Good conductors (low resistance): Silver, Copper, Gold, Aluminum
• Moderate resistance: Nichrome (used in heating elements)
• Insulators (very high resistance): Glass, Rubber, Plastic

• Silver has the lowest resistivity among all metals, making it the best conductor.
• Nichrome is used in electric heaters because it has high resistance and does not oxidize easily at high temperatures.
• Copper is commonly used in electrical wiring due to its good conductivity and relatively low cost.