Two copper wires A and B length 30 m and 10 m have radii 2cm and 3cm respectively.
Compare the resistance of two wires. Which will have less resistance?
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Answer:
resistance =( rho * length)/ πr²
resistance a= ( rho * 30)/ π2²
= ( rho * 30)/ 4π
resistance b = ( rho * 20)/ π3²
( rho * 20)/ 9π
Rₐ/Rb= (30/4 ) / (20/9)
Rₐ/Rb = 27/8
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