- #1
mandos
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Homework Statement
(Prior to start of questions, it informs me the relative permittivity of free space is 8.9x10^-12)
2) An alpha particle (charge 3.2x10^-19) approaches to a distance of 1.5x10^-17 from a gold nucleus (charge 1.3x10^-17). Calculate:
a) the strength of the field created by the gold nucleus at the distance of the alpha particles closest approach.
2. Homework Equations + Attempt at a solution
According the back of the book, the answer is 5.2 x 10^22 Vm^-1
Because it gave me the relative permittivity of free space, I tried using that (even though it could be for other questions, like question 1, where I needed it).
So I used F= Q1,Q1 / 4xPiex8.9x10^-12xr^2
Where I used the two charges provided and I used the distance as the radius (r).
That didn't work.
So I assumed that due to the units the back of the book gives (Vm^-1), the right equation to use would be V= Ed. But, if I rearrange is to get E .. I don't have the value of V.
But I do still think that V = Ed is barking up the right tree. But how do I find V? W = VQ? But how do I know W?
The problem is, I can't think of any other equations that are suitable to use, apart from the above two that I've discussed.
Any help would be much appreciated.
(Prior to start of questions, it informs me the relative permittivity of free space is 8.9x10^-12)
2) An alpha particle (charge 3.2x10^-19) approaches to a distance of 1.5x10^-17 from a gold nucleus (charge 1.3x10^-17). Calculate:
a) the strength of the field created by the gold nucleus at the distance of the alpha particles closest approach.
2. Homework Equations + Attempt at a solution
According the back of the book, the answer is 5.2 x 10^22 Vm^-1
Because it gave me the relative permittivity of free space, I tried using that (even though it could be for other questions, like question 1, where I needed it).
So I used F= Q1,Q1 / 4xPiex8.9x10^-12xr^2
Where I used the two charges provided and I used the distance as the radius (r).
That didn't work.
So I assumed that due to the units the back of the book gives (Vm^-1), the right equation to use would be V= Ed. But, if I rearrange is to get E .. I don't have the value of V.
But I do still think that V = Ed is barking up the right tree. But how do I find V? W = VQ? But how do I know W?
The problem is, I can't think of any other equations that are suitable to use, apart from the above two that I've discussed.
Any help would be much appreciated.