A wire with radius of 1 cm and 50 cm length has a resistance of 20 ohm. The resistivity in (Ω⋅m) of this material is Select one: a. 1.26 x 102 b. 1.26 x 10-2 c. 79 d. 1.26 x 10-6 e. 2.52 x 106
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Answer:
d. is the correct answer
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=> R = p × L/A
therefore, p = R × A / L---(1)
A= πr² = 3.14×1² = 3.14cm².
L= 50 cm
R= 20 ohm
Put the value in eq(1)-
p = 20 × 314/50×100
p = 6280/5000 = 628/500 ans.
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