The names of the four materials have been given, select the one which has the least resistivity at 20°C?

• A. Glass
• B. Nichrome
• C. Iron
• D. Silver

Answer: (D)

The resistivity of iron at 20°C is 9.71 × 108
The resistivity of silver at 20°C is 1.59 × 108
The resistivity of Glass at 20°C is 1.10 × 109
The resistivity of nichrome at 20°C is 100 × 108
Hence silver is the least resistive material in the given option.