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The resistance of wire of length 5m, area of corss-section is 2 mm 2 and resistance is 10 ohms. The resistance of another wire is 20 ohms with same material of length 20m & area of cross-section is 10 mm 2 . Calculate the ratio of specific resistivity of these two wires.

The resistance of wire of length 5m, area of corss-section is 2 mm2 and resistance is 10 ohms.
The resistance of another wire is 20 ohms with same material of length 20m & area of cross-section is 10 mm2. Calculate the ratio of specific resistivity of these two wires.
 
 

Grade:12

1 Answers

Raza Ahmed
20 Points
2 years ago
R = PL/A
 
Resistance = (specific resistivity x length of wire) / cross sectional area
 
P1/P2 = (R1A1L2)/(R2A2L1)
 
put values in SI units and get answer
 
in this case answer is coming 2/5

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