The bob of a simple pendulum of length l is m | vedclass

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(D) The iron bob is attracted by the magnetic field produced by the current-carrying coil. This magnetic force acts in the same direction as gravity,e

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$T < 2\pi \sqrt{\frac{l}{g}}$ and damping is larger than in air alone.

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(D) The iron bob is attracted by the magnetic field produced by the current-carrying coil. This magnetic force acts in the same direction as gravity,effectively increasing the acceleration due to gravity $(g_{eff} > g)$. Since $T = 2\pi \sqrt{\frac{l}{g_{eff}}}$,an increase in effective gravity leads to a decrease in the time period,so $T < 2\pi \sqrt{\frac{l}{g}}$. Additionally,the motion of the iron bob in the magnetic field induces eddy currents in the bob,which leads to energy dissipation and increased damping compared to oscillation in air alone.

The bob of a simple pendulum of length $l$ is made of iron. The pendulum is oscillating over a horizontal coil carrying a direct current. If the time period of the pendulum is $T$,then:

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