What force is responsible for the repulsion between two positively-charges particles?

How have the competing explanations' experiments on atoms affected the development of the atomic model?

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow