A copper wire of radius r and length I has a resistance of R. A second copper wire with radius 2r and length I is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

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Q: 28 (CDS-I/2017)
A copper wire of radius r and length I has a resistance of R. A second copper wire with radius 2r and length I is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,1,12,4,4,4,1

keywords: 

{'resultant resistance': [0, 0, 0, 2], 'second copper wire': [0, 0, 0, 1], 'copper wire': [0, 0, 0, 3], 'resistance': [0, 0, 1, 2], 'parallel combination': [0, 0, 0, 3], 'wires': [0, 0, 1, 1], 'radius 2r': [0, 0, 0, 1], 'length': [0, 0, 1, 0]}