Three resistance \( \mathrm{P}, \mathrm{Q}, \mathrm{R} \) each of \...

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Three resistance \( \mathrm{P}, \mathrm{Q}, \mathrm{R} \) each of \( 2 \Omega \) and an unknown resistance
P \( \mathrm{S} \) form the four arms of a Wheatstone's bridge circuit. When

W. a resistance of \( 6 \Omega \) is connected in parallel to \( S \) the bridge gets balanced. What is the value of \( \mathrm{S} \) ?
a. \( 2 \Omega \)
b. \( 3 \Omega \)
c. \( 6 \Omega \)
d. \( 1 \Omega \)
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