an electron travels at a horizontal velocity of 5×10^6m/s in vacuum between two charged plates 100mm long and 20mm apart, towhich potential difference of 30v is applied. the chargeon an electron is 1.5×10^-19c and the mass of an electron is 9.1×10^_31kg. what size force will the electron experience while it passes through the plates?​

Ireally don’t know

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