50kg of water at 0ºC have to be frozen into ice in a refrigerator. The room temp. is 20ºC. What is the minimum work input to the refrigerator to achieve this?
(latent heat of fusion of water=3.33x10^5J/kg)
ans:1.22x10^6J
It is proposed to heat a house using a heat pump operating between the...
[SIZE="5"]A line charge of uniform charge density lambda forms a circle of radius b that lies in the x-y plane with its centre at the origin.
a)Find the electric field E at the point (0,0,h).
b)At what value of h will E in parta) be a maximum?What is this maximum?
ans...
I cannot answer the questions correctly.I try all my best.Firstly, the teacher said this is not a infinite line charge in the 1st question,instead it is a point charge.So, the Gauss's law is not appropriate. I use the Coulomb's law.But...I skill don't know how to do it.
1.In the diagram below, find the E field at point P.What is E when L is infinity
2.A closed surface is made up of three surfaces,S1 being circular , S2 being cylindrical, and S3 being conical.A line charge of length L and density (D) is placed symmetrically with respect to S2 as shown.If the...