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1 answer:
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Answer:
K' = 1200 J
Explanation:
To find the kinetic energy you first take into account the formula for the kinetic energy of the charge:
= 800J (1)
m: mass of the charge
v: final speed of the charge when it reaches the positively charged plate.
Furthermore, you have that the acceleration of the charge is obtained by using the second Newton law:
(2)
a: acceleration
E: electric field
q: charge
The electric field between two parallel plates is V/d, being V the potential difference and d the separation between plates. You replace E in (2) and obtain:
Next, you take into account the following formula for the calculation of the final speed of the charge:
Next, you replace this value of v in (1):
= 880J (3)
If the distance between plates is tripled, and the potential difference is halved, you have for the new final speed:
And the kinetic energy becomes:
(4)
You calculate the ratio between both kinetic energies K and K', that is, you divide equations (3) and (4), in order to find the new kinetic energy:
hence, the kinetic energy of the charge incresases to 1200J
Answer:
Fields and variables are proportional
Explanation:
To solve the problem we must first identify the Vector Intensity,
The intensity is given by:
We also know that the change given by the Intensity is always the square of the amplitude,
This is,
The intensity is <em>proportional</em> to the change exerted on
That is to say that in turn the amplitus is <em>proportional</em> to the Intensity.
On the other hand, relating the two variables we have
In this way we can conclude that the electric field of intensity is also <em>proportional</em> to