A wire of resistivity P is stretched to 3 times its length. If it’s initial resistance is R, then, what will be it’s final resistance?
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A wire of resistivity P is stretched to 3 times its length. If it’s initial resistance isA wire of resistivity P is stretched to 3 times its length. If it’s initial resistance is R, then, what will be it’s final resistance? R, then, what will be it’s final resistance?
Explanation:
A wire of resistivity P is stretched to 3 times its length. If it’s initial resistance is R, then, what will be it’s final resistance?
A wire of resistivity P is stretched to 3 times its length. If it’s initial resistance is R, then, what will be it’s final resistance?
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The final resistance of the wire will be equal to 9R
Explanation:
- the resistance is directly proportional to the length of the wire and inversely proportional to the area of cross section of the wire. If there is an increase in the length of the wire by stretching there will be increase in the length but decrease in area.
- The decrease in area will be proportional to the increase in length since the volume will be equal. Hence there will be increase in resistance 3² times
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