To solve this problem we will apply the concept of balance of Forces in the body. For such an effect the centripetal force must be equivalent to the electrostatic force of the body, therefore
Here
m = Mass of electron
r = Distance between them
k = Coulomb's constant
= Charge of proton
= Charge of electron
v = Velocity
Rearranging to find the velocity we have that,
Replacing,
Therefore the speed of the electron is
Explanation:
divide the distance by the time it takes to travel that same distance, then add your direction to it.
Or change in displacement divided by change in time.
The answer should be A, because efficiency = (effective work)/(executed work) * 100%
C)1/2, in electrical forces, If distance between the two objects was increased, then force decreases.