A wire elongates by 
mm when a load W is hanged from it. If the wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (in mm)
a)
b)
c)
Zero
d)
A wire elongates by mm when a load W is hanged from it. If the wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (in mm)
a)
b)
c)
Zero
d)
Question ID - 55773 | SaraNextGen Top Answer
A wire elongates by mm when a load W is hanged from it. If the wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (in mm)
a)
b)
c)
Zero
d)
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A wire elongates by |
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a) |
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b) |
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c) |
Zero |
d) |
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1 Answer
127 votes
Answer Key / Explanation : (a) -
(a)
Let us consider the length of wire as L and cross-sectional area A, the material of wire has Young’s modulus as Y.
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Then for 1st case 
For 2 nd case, 
So, total elongation of both sides 
127 votes
Answer Link
127