An example of the energy transformation of mechanical energy to electrical energy is
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To solve this problem it is necessary to take into account the concepts of Intensity as a function of Power and the definition of magnetic field.
The intensity depending on the power is defined as
Where
P = Power
r = Radius
Replacing the values that we have,
The definition of intensity tells us that,
Where,
Magnetic field
Permeability constant
c = Speed velocity
Then replacing with our values we have,
Re-arrange to find the magnetic Field B_0
Therefore the amplitude of the magnetic field of this light is
The electrostatic force between two charges q1 and q2 is given by
where
is the Coulomb's constant
is the distance between the two charges.
In our problem, the two charges are two electrons, so their charges are equal and equal to
By substituting these values, we find the intensity of the force between the two electrons:
This is the magnitude of the force each electron exerts to the other one. The direction is given by the sign of the charges: since the two electrons have same charge, they repel each other, so the force exerted by electron 1 is toward electron 2 and viceversa.
where
In our problem, the two charges are two electrons, so their charges are equal and equal to
By substituting these values, we find the intensity of the force between the two electrons:
This is the magnitude of the force each electron exerts to the other one. The direction is given by the sign of the charges: since the two electrons have same charge, they repel each other, so the force exerted by electron 1 is toward electron 2 and viceversa.