question_answer

The potential difference across 8 ohm resistance is 48 volt as shown in the figure. The value of potential difference across X and Y points will be                                   [MP PET 1996]

A)            160 volt

B)            128 volt

C)            80 volt

D)            62 volt

Correct Answer: A

Solution :

                   The given circuit can be redrawn as follows Resistance between A and B \[=\frac{24\times 8}{32}=6\,\Omega \] Current between A and B = Current between X and Y \[=i=\frac{48}{6}=8A\] Resistance between X and Y \[=(3+10+6+1)=20\,\Omega \] Þ Potential difference between X and Y = 8 ´ 20 = 160 V