22.11 Projection of an element of area dA of a sphere of radius R onto a concentric sphere of radius 2R. The projection multi- plies each linear dimension by 2, so the area element on the larger sphere is 4 dA. The same number of field lines and the same flux pass through both of these area elements. E

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Can you explain thoroughly how dA become 4dA?

22.11 Projection of an element of area dA
of a sphere of radius R onto a concentric
sphere of radius 2R. The projection multi-
plies each linear dimension by 2, so the
area element on the larger sphere is 4 dA.
The same number of field lines and the same
flux pass through both of these area elements.
E
4 dA
dA
R-+
2R
Transcribed Image Text:22.11 Projection of an element of area dA of a sphere of radius R onto a concentric sphere of radius 2R. The projection multi- plies each linear dimension by 2, so the area element on the larger sphere is 4 dA. The same number of field lines and the same flux pass through both of these area elements. E 4 dA dA R-+ 2R
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