Physics · 2013
JEE Main · 23 April 2013, Shift 1 · Q9
Bob of a simple pendulum of length l is made of iron. The pendulum is oscillating over a horizontal coil carrying direct current. If the time period…
Bob of a simple pendulum of length $\displaystyle l$ is made of iron. The pendulum is oscillating over a horizontal coil carrying direct current. If the time period of the pendulum is T then :
Official answer
(4)
$\displaystyle T<2 \pi \sqrt{\frac{l}{g}}$ and damping is larger than in air alone.
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JEE Main 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.