One formula for the power dissipated in an electric circuit is
Power = (current)² x (resistance) .
I think that's the one we should use, because it has exactly
all of the quantities that we know or need to find.
OK.
Original power = (original current)² x (original resistance)
and
New power = (new current)² x (new resistance)
= (0.5 x old current)² x (3 x old resistance)
= (0.25) (old current)² x (3) (old resistance)
= (0.75) (original current)² (original resistance)
= (0.75) (original power) .
Summary: New power = (0.75) (original power)
That looks just like
choice B:
The power will decrease to 75 percent of its previous value.
Answer: 4
Explanation: when you're solving velocity you should divide the two numbers so 16/4=4
To be able to solve this problem it is necessary to take into account the concepts of Electric Flow
on a closed surface.
By definition we know that the flow across a closed surface is
And we know that the Coulumb's law says
We can replace, so
Solving the integral we reach the expression,
The charge of a proton is , but we have 2 protons, then
The constant of permittivity of free space ) is H/m
Replacing we have that the flux is
We can also calculate the Volume of a Sphere, that is
Through this value is easy now calculate the dirvegence of the electric field, which is given by,
As an object falls toward earth, the potential energy of the object : Decreases
Here's the formula for the Potential energy :
E = Em + Ek + Eg
m = mass
= k kinetic
g = gravity
As the potential energy falls toward earth, the Eg became 0, which will decrease its amount
the electric force decreases because the distance has an indirect relationship to the force
Explanation:
The electric force between two objects is given by
where
k is the Coulomb's constant
q1 and q2 are the charges of the two objects
r is the distance between the two objects
As we can see from the formula, the magnitude of the force is inversely proportional to the square of the distance: so, when the distance between the object increases, the magnitude of the force decreases.