A wire of length 3m and area of cross -section 1,7x10-6m2 has a resistance 3x10-2ohm(a)what is the formula of resistivity of the wire and what is the unit of it? (B) calculate the resistivity if the wire
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Answer:
(A) formula of resistivity=resistance×lengthof wire
Area of cross section
Unit of resistivity is ohm metre.
(B) resistivity of wire is 17×10-⁴.
Explanation:
Lenght of wire=3.
Area of cross section=17×10-² m².
Resistance of the wire= 3×10-6 Ohm.
resistivity=Area × resistance
lenght
= 17×10-6 × 3×10-²
3
= 17 × 10- ⁴ ohm metre.
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