Physics · 2019
JEE Main · 12 April 2019, Shift 2 · Q5
A spring whose unstretched length is l has a force constant k. The spring is cut into two pieces of unstretched lengths l_1 and l_2 where, l_1= n l_2…
A spring whose unstretched length is $\displaystyle l$ has a force constant k . The spring is cut into two pieces of unstretched lengths $\displaystyle l_1$ and $\displaystyle l_2$ where, $\displaystyle l_1=\mathrm{n} l_2$ and n is an integer. The ratio $\displaystyle \mathrm{k}_1 / \mathrm{k}_2$ of the corresponding force constants, $\displaystyle \mathrm{k}_1$ and $\displaystyle \mathrm{k}_2$ will be :
Official answer
(2)
$\displaystyle \frac{1}{n}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.