MCQ
If a spring is extended to length $l,$ then according to Hook's law
- ✓$F = kl$
- B$F = \frac{k}{l}$
- C$F = {k^2}l$
- D$F = \frac{{{k^2}}}{l}$
✓
Answer
Correct option: A.
$F = kl$
a
(a) $\frac{\text { stress }}{\text { sbrain }}=k=E$
(a) $\frac{\text { stress }}{\text { sbrain }}=k=E$
$\frac{F L}{A l}=E$
$\frac{E A}{L}=k$
$F=\frac{E A}{L} \times l$
$F=k l$
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