In Thomson's experiments with electron beams, when the magnetic force FM balanced the force of the electric field Fe, the veloci
1 answer:
In Thomson's experiment, when the magnetic force balanced the electric force, the velocity of the beam was
where E is the magnitude of the electric field and B the magnitude of the magnetic field.
Let's see why. The force exerted by the electric field of intensity E on each electron is
where
is the electron charge.
The force exerted by the magnetic field of intensity B on each electron is
where v is the speed of the electrons.
When the two forces are balanced, we have:
from which we find
where E is the magnitude of the electric field and B the magnitude of the magnetic field.
Let's see why. The force exerted by the electric field of intensity E on each electron is
where
The force exerted by the magnetic field of intensity B on each electron is
where v is the speed of the electrons.
When the two forces are balanced, we have:
from which we find
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The figure shown below illustrates a lever being used to lift a weight W.
The applied force is F.
In order to lift the weight, the minimum applied force is
F*b = W*a
F = (a/b)W
When the ratio a/b < 1, then the applied force is less than the weight.
The principle behind the use of a lever is to keep the ratio a/b small in order to decrease the effort force.
Answer: A
A lever is used to decrease effort force.
The applied force is F.
In order to lift the weight, the minimum applied force is
F*b = W*a
F = (a/b)W
When the ratio a/b < 1, then the applied force is less than the weight.
The principle behind the use of a lever is to keep the ratio a/b small in order to decrease the effort force.
Answer: A
A lever is used to decrease effort force.
Answer:
Er = 231.76 V/m, 27.23° to the left of E1
Explanation:
To find the resultant electric field, you can use the component method. Where you add the respective x-component and y-component of each vector:
E1:
E2:
Keep in mind that the x component of electric field E2 is directed to the left.
∑x:
∑y:
The magnitud of the resulting electric field can be found using pythagorean theorem. For the direction, we will use trigonometry.
or 27.23° to the left of E1.
