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Question

The mass of the three wire of copper are in the ratio 1:3:5, and their lengths are in ratio 5:3:1.  The ratio of their  electrical resistance is


Your Answer
A
1:3:5
Your Answer
B
5:3:1
Your Answer
C
1:15:125
Correct Answer
D
125:15:1

Solution

The correct option is D 125:15:1
R=ρIA=ρI2AI=ρl2V=ρl2m/d=ρdl2mOr RI2mR1:R2:R3=I12m1:I22m2:I23m3=251:93:15=125:15:1

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