A) 5
B) 7.5
C) 15
D) 12.5
Correct Answer: C
Solution :
Total resistance of the circuit \[R+\frac{({{R}_{1}}+{{R}_{2}})\times {{R}_{3}}}{({{R}_{1}}+{{R}_{2}})+{{R}_{3}}}\] \[=35+\frac{(15+15)\times 30}{(15+15)+30}\] \[=35+\frac{30\times 30}{30+30}=50\,\,\Omega \] Current in circuit, \[i=\frac{50}{50}=1\,A\] Current through \[{{R}_{3}},\,i={{i}_{2}}=\frac{1}{2}A\] Potential difference across \[{{R}_{3}}\] \[=i\times {{R}_{3}}=\frac{1}{2}\times 30=15\,\,V\]You need to login to perform this action.
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