In a Wheatstone bridge (see fig.),

Question:

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

  1. (1) $401.5 \mathrm{ohm}$

  2. (2) $404.5 \mathrm{ohm}$

  3. (3) $403.5 \mathrm{ohm}$

  4. (4) $402.5 \mathrm{ohm}$


Correct Option: , 4

Solution:

(4)

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