The length of an elastic string is $$a$$ metre when the longitudinal tension is $$4$$ N and $$b$$ metre when the longitudinal tension is $$5$$ N. The length of the string in metre when the longitudinal tension is $$9$$ N will be:

 1 $$a-b$$ 2 $$5b-4a$$ 3 $$2b-\frac{1}{4}a$$ 4 $$4a-3b$$
Subtopic: Â Hooke's Law |
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Hooke's law is applicable for:

 1 elastic materials only 2 plastic materials only 3 elastomers only 4 all of these

Subtopic: Â Hooke's Law |
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Two wires of copper having length in the ratio of 4: 1 and radii ratio of 1: 4 are stretched by the same force. The ratio of longitudinal strain in the two will be:

 1 1: 16 2 16: 1 3 1: 64 4 64: 1
Subtopic: Â Hooke's Law |
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The length of elastic string, obeying Hooke's law is ${l}_{1}$ metres when the tension is 4N, and ${l}_{2}$ metres when the tension is 5N. The length in metres when the tension is 0 N will be:

1. $5{l}_{1}-4{l}_{2}$

2. $5{l}_{2}-4{l}_{1}$

3. $9{l}_{1}-8{l}_{2}$

4. $9{l}_{2}-8{l}_{1}$

Subtopic: Â Hooke's Law |
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