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integral (from r1 to r2 ) 1/2*4pi*10^-7(2k*( 4/5 *pi* a (r^5 - r1^5))*k*Q/r^4 +(k*( 4/5 *pi* a (r^5 - r1^5)) /r²)²)dr ,r1 < r2
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