Question

The SI unit of electrical conductivity is:

• A. \( \text{S m} \)
• B. \( \Omega \, \text{m} \)
• C. \( \text{S m}^{-1} \)
• D. \( \Omega \, \text{m}^{-1} \)

Hint:

The unit of electrical conductivity is also known as Siemens per meter (S/m). Remember that it is the reciprocal of resistivity.

Answer 1

The Correct Option is C

Electrical conductivity is the reciprocal of electrical resistivity. The unit of electrical resistivity is ohm-meter (\( \Omega \, \text{m} \)), and the unit of electrical conductivity is the reciprocal of resistivity. \[ \text{Conductivity} = \frac{1}{\text{Resistivity}} \] So, the unit of electrical conductivity is the reciprocal of \( \Omega \, \text{m} \), which is: \[ \text{Unit of conductivity} = \Omega^{-1} \, \text{m}^{-1} = \text{S m}^{-1} \] Therefore, the SI unit of electrical conductivity is \( \text{S m}^{-1} \).