charge density when the charge density is shoe out the volume of a body then the charge for unit volume is called volume charge density and it is represent by ρ. •: ρ = Vq
Volume charge density: When the charge density is throughout the volume of a body, then the charge per unit volume is called volume charge density and it is represented by ρ.
Hence the unit of ρ is Cm
Example: If a charge q is uniformly distributed in the whole volume of a
sphere of radius R, then p =
30 Bricks = 1brick weight× 30 Bricks
30 Bricks= 12×30
1. Work done= Force× Distance
= 18×10³ J
2. Power= Work done/ Time
The Carnot engine has zero power
Although theoretically the Carnot engine has more efficiency than the real engine. In practice however they tend to have zero power.
This is because all its processes are reversible (that is isothermic and adiabatic).
So the system equilibrates with its surroundings at every point in time. This makes work done very slow and the power generated is zero.
Carnot cycles requires attaining isothermal heat transfers which is quite difficult and take a long time. Also a pump that can handle liquid-vapour phase mixture will be required.
This is not practical.