Why Is My Electric Potential Calculation Incorrect?

AI Thread Summary
The user is struggling with electric potential calculations involving a proton and the potential energy of two protons. They calculated the electric potential at a distance of 3.0E-15m from a proton using the formula V=kQ/r, resulting in 4.8E-25 V, which was marked incorrect. For the potential energy of two protons at the same distance, they used V=k(1.6*10E-19)^2/r and obtained 7.68E-44J, also deemed incorrect. The discussion suggests that arithmetic errors may be the cause of the incorrect answers.
supermenscher
Messages
47
Reaction score
0
I have done this problem over and over and keep getting the wrong answer. What is the electric potential a distance of 3.0E-15m away from a proton.

I used V=kQ/r and got 4.8E-25 V, and it says the answer is wrong.

The second part of the question asks what is the potential energy of a system that consists of 2 protons 3.0E-15m apart.

I used V=k(1.6*10E-19)^2/r and got 7.68E-44J and webassign told me it was wrong. Can anyone help
 
Physics news on Phys.org
Thank you so much
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Electric potential of nested spherical shells
Replies
4
Views
866
Why Is the Electric Potential the Same for Inner and Outer Semi-Circles?
Replies
7
Views
1K
Potential and Electric Field near a Charged CD Disk
Replies
2
Views
2K
Why Is Work Positive When Done Against the Electric Field?
Replies
22
Views
3K
Potential difference between two points in an electric field
Replies
1
Views
2K
MIT OCW, 8.02 Electromagnetism: Potential for an Electric Dipole
Replies
1
Views
2K
The potential electric and vector potential of a moving charge
Replies
1
Views
2K
Calculating eletric potential using line integral of electric field
Replies
1
Views
2K
The electric field from its electric potential: semicircle
Replies
11
Views
2K
Poisson's equation: Calculating the Laplacian of an electric potential
Replies
3
Views
1K

Hot Threads

Recent Insights

Back
Top