The potential gradient long the length of a uniform wire is `10 "volt"//meter`. `B` and `C` are the two points at `30 cm` and `60 cm` point on a meter scale fitted along the wire. The potential difference between `B` and `C` will be

Options

A. 3 volt
B. 0.4 volt
C. 7 volt
D. 4 volt

Answer

A

Explanation

(a) Potential gradient = Change in voltage per unit length
`:. 10 = (V_(2) - V_(1))/(30//100) implies V_(2) - V_(1) = 3` volt`