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Dassinia
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Hello,
We use an accelerator to uniformly implant electrons in a block of lucite, its surface is 25 cm², thickness 12mm.
The current of the electron beam is 0,1 µA and the implantation takes 1s.
The electrons are "trapped" in a layer of uniform density of 2mm thickness whose center is at 6 mm of the block surface. The two large surfaces have same potential V=0.
- Find the polarization charge density ρp in each of the three regions of the block.
- Find the polarization charge density of surface σp over the two large surfaces of the block.
ρ= ∇. D
D=εoE+P
P=εo XeE
σp= P.n^
I'd say that outside the layer where the electrons are ρp =0
And I am really really stuck ..
I have to return this before the end of tomorow, and I'm not getting any of this.. I've read the course notes a hundred times
Thanks !
Homework Statement
We use an accelerator to uniformly implant electrons in a block of lucite, its surface is 25 cm², thickness 12mm.
The current of the electron beam is 0,1 µA and the implantation takes 1s.
The electrons are "trapped" in a layer of uniform density of 2mm thickness whose center is at 6 mm of the block surface. The two large surfaces have same potential V=0.
- Find the polarization charge density ρp in each of the three regions of the block.
- Find the polarization charge density of surface σp over the two large surfaces of the block.
Homework Equations
ρ= ∇. D
D=εoE+P
P=εo XeE
σp= P.n^
The Attempt at a Solution
I'd say that outside the layer where the electrons are ρp =0
And I am really really stuck ..
I have to return this before the end of tomorow, and I'm not getting any of this.. I've read the course notes a hundred times
Thanks !
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