In a Wheatstone bridge (see fig.), Resistances P and Q are approximately equal. When R = 400 W, the bridge is balanced. On interchanging P and Q, the value of R, for balance, is 405W. The value of X is close to :

Question:

In a Wheatstone bridge (see fig.), Resistances $\mathrm{P}$ and $\mathrm{Q}$ are approximatelyequal. 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 :

  1. $401.5$ ohm

  2. $404.5$ ohm

  3. $403.5 \mathrm{ohm}$

  4. $402.5 \mathrm{ohm}$


Correct Option: 4

Solution:

(4)

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