A) \[2.5\,\Omega .\text{ }6\text{ }V\]
B) \[3.5\text{ }\Omega ,\text{ }6\text{ }V\]
C) \[2.5\text{ }\Omega ,\text{ }7\text{ }V\]
D) \[3.5\text{ }\Omega \text{ }7\text{ }V\]
Correct Answer: D
Solution :
(d) \[3.5\,\Omega ,\text{ }7\text{ }V\] Given, \[\varepsilon =15\,V,r=4\,\Omega ,\,l=2A\] Now, for resistance of the resistors \[\varepsilon -lr=V=lR;15-2\times 4=2\times R:15-8=2R\] \[R=\frac{7}{2}=3.5\,\Omega \] Terminal voltage of battery, \[V=lR=2\times 3.5=7V\]
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