Question

Arrange the following materials in the increasing order of their resistivity: (A) Copper, (B) Platinum, (C) Silver, (D) Aluminium.

• A. (A), (C), (B), (D)
• B. (C), (A), (D), (B)
• C. (C), (B), (A), (D)
• D. (B), (D), (A), (C)

Answer 1

The Correct Option is B

 The resistivity (\( \rho \)) of a material is a measure of how strongly it opposes the flow of electric current. Here are the typical resistivity values for the given materials at room temperature (20°C):

Material	Resistivity (\( \rho \))	Unit
Silver (C)	\( 1.59 \times 10^{-8} \)	Ω·m
Copper (A)	\( 1.68 \times 10^{-8} \)	Ω·m
Aluminium (D)	\( 2.65 \times 10^{-8} \)	Ω·m
Platinum (B)	\( 1.06 \times 10^{-7} \)	Ω·m

Step 1: Compare the resistivity values

From the table, we can see the order from lowest to highest resistivity is:

Silver (C) < Copper (A) < Aluminium (D) < Platinum (B)

Step 2: Final Order

Increasing order of resistivity: C (Silver) < A (Copper) < D (Aluminium) < B (Platinum)