Please answer this, show your solutions in paper.I will give you a very good feedback. Thank you!In paper please :(

1. Two small similar pith balls are 3 cm. apart in air and can: charges at 3 x 1D ' 5' and12 x 1D '9 $153.. respectively. [a] Compute the force {if attractipn between them. [b] If the balls are touched and then separated by a distance {if 3 man what will be the force between them? Charges of +;, +3 and 3 pt? are placed in air at the 1:rertjces of an equilateral triangle of side 113 cm. Calculate the magnitude at the force acting on the 8 prC due to the other 2 charges