Question

The electrical resistivity of silver at 20$^\circ$C is

• A. $49 \times 10^{-6} \, \Omega m$
• B. $1.60 \times 10^{-8} \, \Omega m$
• C. $10^{12} \, \Omega m$
• D. $6.84 \times 10^{-8} \, \Omega m$

Hint:

Silver has the lowest resistivity, followed closely by copper, which is more commonly used due to cost.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Resistivity is a property of materials that determines how strongly they oppose electric current. Silver is one of the best conductors.
Metals like copper and silver have very low resistivity (close to $10^{-8} \, \Omega m$).
Insulators like rubber and wood have extremely high resistivity (up to $10^{12} \, \Omega m$).
Step 2: Detailed Explanation:
At 20$^\circ$C, the resistivity of silver is approximately $1.60 \times 10^{-8} \, \Omega m$, which is among the lowest for any material. This makes silver an excellent conductor.
Step 3: Final Answer:
The resistivity of silver at 20$^\circ$C is $1.60 \times 10^{-8 \, \Omega m$}.