A regular pentagon with sides of length l=10 cm and radius r=8.5 cm, has a charge at each vertex. Four of the vertices have charge 36 μC, and one has charge -17 μC. What is the magnitude of the electric field at the center of the pentagon in units of 106 N/C? Take k=9x109 Nm2/C2. (Hint: you can do this without angles or trigonometry if you use symmetry...) Your result must contain at least one figure after the decimal point and maximum of 5% of error is accepted in your answer.

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

35.98  million  mile my friend