SI unit of resistivity is:
Correct answer: C. Ω-m
- A. Ω-m2
- B. (Ω-m)-3
- C. Ω-m
- D. (Ω-m)-1
Explanation
Resistivity (ρ) is a measure of how strongly a material opposes the flow of electric current. It is a property of a material and is given by the formula:ρ = R × A / LWhere:ρ = resistivity of the materialR = resistance of the material (in ohms, Ω)A = cross-sectional area of the material (in square meters, m²)L = length of the material (in meters, m)The SI unit of resistivity is ohm-meter (Ω-m), which is obtained by combining the SI unit of resistance (ohm, Ω) with the SI unit of length (meter, m). Therefore, option C) Ω-m is the correct answer.
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Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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