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Q.

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

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a

3 volt

b

0.4 volt

c

7 volt

d

4 volt

answer is A.

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Detailed Solution

Potential gradient = Change in voltage per unit length∴   10 =V2 −V130/100  ⇒ V2 −V1 =3  volt
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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