NEET Questions Solved

The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance

(1) Length = 50 cm, diameter = 0.5 mm

(2) Length = 100 cm, diameter = 1 mm

(3) Length = 200 cm, diameter = 2 mm

(4) Length = 300 cm, diameter = 3 mm

(1) $R\propto \frac{l}{{r}^{2}}$.

For highest resistance $\frac{l}{{r}^{2}}$ should be maximum, which is correct for option (1)

Difficulty Level:

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