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From formula, f ∝ 1 / l √(T/m). Therefore, positions of two bridges below the wire are 15 × 100 / (15 + 5 + 3) cm and 15 × 100 + 5 × 100 / (15 + 5 + 3) cm i.e., 1500 / 23 cm and 2000 / 23 cm.

1. f ∝ 1 / l √(T/m)
2. Positions of bridges are 1500 / 23 cm and 2000 / 23 cm
3. Given: f1 : f2 : f3 = 1 : 3 : 5
4. l1 : l2 : l3 = 1 / f1 : 1 / f2 : 1 / f3

Correct answer: Positions of bridges are 1500 / 23 cm and 2000 / 23 cm

Solution

The positions of the bridges are calculated using the given formula and the provided values, resulting in 1500/23 cm and 2000/23 cm. This matches option B.

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