Physics Current Electricity SZABMU 2023
PMDC Verified Question 34 of 112
The unit of resistivity is:
A
Ohm
B
Ohm meter
C
Ohm/meter
D
Meter/ohm
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Ohm meter
Concept:

Resistivity is calculated by rearranging the resistance formula.

Formula:

$$ \rho = \frac{R \cdot A}{L} $$

Solution:

  • Unit of \( R \) is Ohms (\( \Omega \)).


  • Unit of Area \( A \) is square meters (\( m^2 \)).


  • Unit of length \( L \) is meters (m).


  • Plugging in the units: \( \frac{\Omega \cdot \text{m}^2}{\text{m}} = \Omega \cdot \text{m} \).


  • Therefore, the unit is Ohm meter.


Why other options are incorrect:

  • Opt A: Ohm is the unit for Resistance.


  • Opt C: Ohm/meter describes resistance per unit length, not resistivity.

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