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In a meter bridge setup, the balance point is found 20 cm from one end of the wire when resistance X is compared with resistance Y. Given that X < Y, what will be the balance point measured from the same end if the resistance 4X is now balanced against Y?

1. 40 cm
2. 80 cm
3. 50 cm
4. 70 cm

Correct answer: 50 cm

Solution

When resistance X is less than Y, the balance point is closer to X. If we now use 4X against Y, the increased resistance of 4X will shift the balance point further away from X, resulting in a new balance point at 50 cm from the same end.

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