question_answer

For the given circuit diagram, the equivalent resistance across battery is

A)  \[5\,\,\Omega \]               

B)  \[10\,\,\Omega \]

C)  \[20\,\Omega \]

D)  \[15\,\,\Omega \]

Correct Answer: D

Solution :

Resistance \[8\,\Omega \], and \[0.5\,\Omega \] are in series and Resistance \[7\,\Omega ,\,1\Omega \] and \[10\,\Omega \] are also in series. Equivalent resistance across battery is                 \[{{R}_{eq}}=8.5+2+4.5\] \[=15\,\Omega \]