A) \[\frac{16}{5}\Omega \]
B) \[\frac{15}{4}\Omega \]
C) \[\frac{14}{4}\Omega \]
D) \[\frac{13}{3}\Omega \]
Correct Answer: B
Solution :
For \[{{V}_{P}}-{{V}_{Q}}=8V\] current in 60 will be zero. Potential difference across 30 resistor = 12 - 8 = 4V current through \[3\Omega \] resistance = ? A Now for outer loop Current \[\frac{net\,emf}{resis\,\tan ce}\,=\frac{12-3}{3+R}\,=\frac{4}{3}\] 27 = 12 + 4R
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