Physics · 2026
JEE Main · 23 January 2026, Shift 1 · Q35
A simple pendulum of string length 30 cm performs 20 oscillations in 10 s. The length of the string required for the pendulum to perform 40…
A simple pendulum of string length $\displaystyle 30$ cm performs $\displaystyle 20$ oscillations in $\displaystyle 10$ s. The length of the string required for the pendulum to perform $\displaystyle 40$ oscillations in the same time duration is
$\displaystyle \_\_\_\_$ cm. [Assume that the mass of the pendulum remains same.]
Official answer
From NTA’s final answer key for this paper.
(3)
$\displaystyle 7.5$
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JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.