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Q. No.The length of a metallic wire is \(l_1,\) when the tension in it is \(T_1\) and is \(l_2\) when the tension is \(T_2.\) The original (natural) length of the wire is:
| 1. | \(\dfrac{l_1+l_2}{2}\) | 2. | \(\dfrac{T_2l_1+T_1l_2}{T_1+T_2}\) |
| 3. | \(\dfrac{T_2l_1-T_1l_2}{T_2-T_1}\) | 4. | \(\dfrac{T_1l_1-T_2l_2}{T_2-T_1}\) |
Subtopic: Â Hooke's Law |
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Level 2: 60%+
JEE
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The length of a light string is \(1.4 ~\text m \) when the tension on it is \(5 ~\text N.\) If the tension increases to \(7 ~\text N,\) the length of the string is \(1.56 ~\text m.\) The original length of the string is: (in m)
1. \(1\)
2. \(10\)
3. \(17\)
4. \(20\)
1. \(1\)
2. \(10\)
3. \(17\)
4. \(20\)
Subtopic: Â Hooke's Law |
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Q. No.
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