AIM -IK 8POB1B. : 7 



pcwed of homogeneous spherical shell* We may also deduce 



means of the equations < 239. 



v do. If a sphere be composed of homo- 



be a fu 



; om the attracted particle ; the reaulunt 

 attract i.-u will act along the *tr. >in* these two 



points, and will be denoted by ' . 



The equation 



r'-a' + ft' + c' 



<lr a dr b dr e 







dVdr 

 3raS 



a <fdV 



?^ 4 ?-& 



TF i'<TF IdV 



. 



<?dv 



= ?-3? + ;aF~? 



By adding these equations we have, by Art 238, at a point 

 e U no particle of tin attracting mass, 



2,/r 



s may be wri 



i ' /r l 



.;)- 



dV C 



fore 



C is some cons' 



to be hollow, and that the attracted 

 io radius i we 



202 



