The potential gradient long the length o...

The potential gradient long the length of a unifrom 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 diffenence between `B` and `C` will be

3 volt

0.4 volt

7 volt

4 volt

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The correct Answer is:

Potential gradient = Change in voltage per unit length
`therefore 10=(V_2-V_1)/"30/100" rArr V_2-V_1 = 3 ` volt

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