In a Wheatstone bridge (see fig), Resistances P and Q are approximately equal. When \[R=400\Omega ,\]the bridge is balanced. On interchanging P and Q, the value of R, for balance, is \[405\Omega ,\]The value of X is close to- |
[JEE Main 11-Jan-2019 Morning] |
A) 401.5 ohm
B) 404.5 ohm
C) 403.5 ohm
D) 402.5 ohm
Correct Answer: D
Solution :
[d] For a balanced bridge, ...(i) |
After interchanging P and Q, ...(ii) |
Multiplying both the equations, |
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