If a spring has time period $$T,$$ and is cut into $$n$$ equal parts, then the time period of each part will be

Moment of inertia of a circular wire of mass $$M$$ and radius $$R$$ about its diameter is

When temperature increases, the frequency of a tuning fork

A charged particle $$q$$ is placed at the centre $$O$$ of cube of length $$L(ABCDEFGH).$$ Another same charge $$q$$ is placed at a distance $$L$$ from $$O$$. Then the electric flux through $$ABCD$$ is