physics

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1) 2 spheres of equal diameters have 15 micro coulomb charge and -10 micro coulomb charge respectively. if they are placed 5cm apart what will be the force of attraction between them?

2) a charge of .5 micro coulomb is placed in an electric field whose intensity is 4x10^5n/c. what is the electric static force acting on the charge?

thanks a log guys!

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