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In a Wheatstone bridge(see fig.), Resistances P and Q are approximately equal. When R = 400 Ω , the bridge is balanced. On interchanging P and Q, the value of R, for balance, is 405 Ω . The value of X is close to : P R Q X G B D A C K 1 K 2

1. 402.5 ohm
2. 401.5 ohm
3. 403.5 ohm
4. 404.5 ohm

Correct answer: 402.5 ohm

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