The potential gradient along the length of a uniform wire is $10\,volt/metre$. $B$ 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 ............. $volt$
A$3$
B$0.4$
C$7$
D$4$
Medium
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A$3$
a Potential gradient $=$ Change in voltage per unit length
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