We have been considering electric fields created by fixed charge distributions and magnetic fields produced by constant currents, but electromagnetic phenomena are not restricted to these stationary situations. Most of the interesting applications of electromagnetism are, in fact, time-dependent. To investigate some of these applications, we now remove the time-independent assumption that we have been making and allow the fields to vary with time. In this and the next several chapters, you will see a wonderful symmetry in the behavior exhibited by time-varying electric and magnetic fields. Mathematically, this symmetry is expressed by an additional term in Ampère’s law and by another key equation of electromagnetism called Faraday’s law. We also discuss how moving a wire through a magnetic field produces an emf or voltage. Lastly, we describe applications of these principles, such as the card reader shown above.

it means that the total charge of a body will always be the integral multiples of basic unit charge ( e )
q = ne
n : no of electrons or protons
e : basic unit charge
1e = 1.602×10^-19

Riya

is the time quantized ? how ?

Mehmet

What do you meanby the statement,"Is the time quantized"

Mayowa

Can you give an explanation.

Mayowa

there are some comment on the time -quantized..

Mehmet

time is integer of the planck time, discrete..

Mehmet

planck time is travel in planck lenght of light..

Mehmet

it's says that charges does not occur in continuous form rather they are integral multiple of the elementary charge of an electron.

Tamoghna

it is just like bohr's theory.
Which was angular momentum of electron is intral multiple of h/2π

The properties of a system during a reversible constant pressure non-flow process at P= 1.6bar, changes from constant volume of 0.3m³/kg at 20°C to a volume of 0.55m³/kg at 260°C. its constant pressure process is 3.205KJ/kg°C
Determine: 1. Heat added, Work done, Change in Internal Energy and Change in Enthalpy

this is the energy dissipated(usually in the form of heat energy) in conductors such as wires and coils due to the flow of current against the resistance of the material used in winding the coil.

Henry

it is the work done in moving a charge to a point from infinity against electric field

As w=mg where m is mass and g is gravitational force... Now if we consider the earth is in gravitational pull of sun we have to use the value of "g" of sun, so we can find the weight of eaeth in sun with reference to sun...

Prince

g is not gravitacional forcé, is acceleration of gravity of earth and is assumed constante. the "sun g" can not be constant and you should use Newton gravity forcé. by the way its not the "weight" the physical quantity that matters, is the mass

Jorge

Yeah got it... Earth and moon have specific value of g... But in case of sun ☀ it is just a huge sphere of gas...

Prince

Thats why it can't have a constant value of g
....

Prince

not true. you must know Newton gravity Law . even a cloud of gas it has mass thats al matters. and the distsnce from the center of mass of the cloud and the center of the mass of the earth

Jorge

please why is the first law of thermodynamics greater than the second

every law is important, but first law is conservation of energy, this state is the basic in physics, in this case first law is more important than other laws..

Mehmet

First Law describes o energy is changed from one form to another but not destroyed, but that second Law talk about entropy of a system increasing gradually

Mayowa

first law describes not destroyer energy to changed the form, but second law describes the fluid drection that is entropy. in this case first law is more basic accorging to me...

Mehmet

define electric image.obtain expression for electric intensity at any point on earthed conducting infinite plane due to a point charge Q placed at a distance D from it.