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Centrifugal force – a force, arising from the body’s inertia, which appears to act on a body moving in a circular path and is directed away from the centre around which the body is moving.

An electric charge always flows from a body at higher potential to a body at a lower potential irrespective of the amounts of charges contained in them. In the question , no current flows. So there is no potential difference.

Because light rays diverge in all directions from their source, the set of rays from each point in space that reach the pupil must be focused. The formation of focused images on the photoreceptors of the retina depends on the refraction (bending) of light by the cornea and the lens.

The Maxwell (symbol: Mx) is the CGS (centimetre-gram-second) unit of magnetic flux (F).
Unit system Gaussian units
Unit of Magnetic flux
Symbol Mx

Named after James Clerk Maxwell

Heat always flows from a body at higher temperature to a body at a lower temperature.

Galileo Galilei is often claimed to be the inventor of the thermometer. However, the instrument he invented could not strictly be called the thermometer, to be the thermometer an instrument must
measure and indicating temperatur; Galileo’s instrument did not do this but merely indicated temperature differences.

Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.

The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
The kelvin (symbol: K) is the base unit of temperature in the International System of Units (SI).
- SI Unit of Heat is Joule.

Persistence of vision works because the human eye and brain can only process 10 to 12 separate images per second, retaining an image for up to a fifteenth of a second. If a subsequent image replaces it in this period of time it will create the illusion of continuity.

The use of animation techniques to create moving images predates conventional cinema. Devices like the phenakistoscope (disk pictured above) and the zoetrope used the basic principles of animation to provide entertainment in the 19th century

Mercury have higher cohesive forces compared to adhesive forces.
So the molecules of mercury are attracted towards its own molecules and will not stick with capillary wall.
Level of mercury will fall because of higher attractive forces of surface molecules with inside molecules of mercury.

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