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Old 2007-09-16, 11:42   #5
davieddy
 
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"Lucan"
Dec 2006
England

2·3·13·83 Posts
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Let R be the radius of the shell, and r be the distance
of m from the centre of the shell.
Let P be a point displaced from the centre towards m by
a distance R^2/r.

Now express the contribution to the resultant force made by
an element of the shell in terms of the solid angle it subtends
at P.
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