Bob of a simple pendulum of length l is made of iron. The pendulum...

Options

1. A$T < 2 \pi \sqrt{\frac{l}{g}}$ and damping is smaller than in air alone.
2. B$T=2 \pi \sqrt{\frac{l}{g}}$ and damping is larger than in air alone.
3. C$T>2 \pi \sqrt{\frac{l}{g}}$ and damping is smaller than in air alone.
4. D$T < 2 \pi \sqrt{\frac{l}{g}}$ and damping is larger than in air alone.