Question

4. The SI Unit of resistivity is:
(a) ohm
(b) ohm-metre
(c) ohm²-metre (d) ohm - metre.​

Answer 1

Answer:

b) ohm-m

resistivity= RA/ l

rho= ohm * m^2 / m

rho= ohm- m

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Answer 2

The SI unit of resistivity is Ohm meter (option b)

• The equation for the SI unit can be derived from the factors area, length, and resistance.
• The resistivity is calculated by the equation "Resistance ×$\frac{Area}{length}$ ".
• The unit of resistance is the ohm, the unit of length is the meter, and that of area meter².
• Therefore, the equation becomes "ohm × $\frac{meter^{2} }{meter}$ ”.
• Cancelling meter with meter² the equation becomes ohm × meter.
• Therefore, we finally deduce the SI unit of Resistivity to be “ohm meter”.  
• The resistance of a conductor whose length is one meter and the area is one meter square in cross-sectional area is identified as resistivity.
• Besides area, length, and resistance, temperature also plays a huge role in determining the resistivity of an object.
• The Greek symbol to represent resistivity is ρ.
• It is also represented as rho.
• The Resistivity will be always high for poor conductors since they do not conduct electricity.