The force exerted on second charge, Physics

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a)  A charge of 3X10-4 Coulomb at P (1, 2, 3) and a charge of -10-4 Coulomb at N (2, 0, 5) in a vacuum. We desire to measure the force exerted on second charge beacuse of  first?
 
b)  A charge of -0.3 micro Coulomb is situated at A (25 , -30 , 15 ) ( in cm ), and a second charge of 0.5 micro Coulomb is at B ( -10 , 8 , 12 ) ( in cm ). Find electric field E at the origin (b) At point A ( 15 , 20 , 50 ) ( in cm )


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