The force of attraction between a divalent cation and an divalent anion is 1. 67 × 10−8 n. If the ionic radius of the cation is 0. 080 nm, what is the anion radius?.

Ibelieve your answer is b.hope this : )

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current