KEAM 2015 Physics and Chemistry Paper

Potential difference between the points O and D (VOD) is 3 times the potential difference between B and O(VBO)
From the figure,VBD=VBO+VOD     [Given]
⇒‌‌VBD=VBO+3VBO  [VOD=3VBO]
⇒‌‌VBD=4VBO
=VBO=‌

30

4

=7.5V
Now, points A and D have same potential.
So,VAO=VOD=VBO=7.5V