JEE Main 2013 Physics question

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 of the pendulum is T then :

(1) and damping is smaller than in air alone.
(2) and damping is larger than in air alone.
(3) and damping is smaller than in air alone.
(4) and damping is larger than in air alone.Correct

Answer: (4)

Solution

The coil's magnetic field attracts the iron bob downward, adding to gravity; the effective g increases, so . Also, the bob

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Question ID VK-104087