An electrostatic sprayer is used in agriculture to apply liquid pesticide onto crop plants.
The pesticide droplets leave the sprayer nozzle with a positive charge. The plants are naturally grounded (connected to 0 V0\text{ V}0 V), which acts as a negative electrode relative to the charged droplets.
Explain how the electrostatic crop sprayer ensures that all parts of the plant, including the undersides of the leaves facing away from the nozzle, receive an even coating of pesticide. Use ideas about electrostatic charges.
Suggest why using an electrostatic crop sprayer is better for the environment than using a conventional, non-electrostatic crop sprayer.
The sprayer nozzle operates using a high-voltage power supply. Why are high voltages a safety hazard?
During a calibration run, the sprayer nozzle transfers 378 C378\text{ C}378 C of charge over a period of 3.5 minutes3.5\text{ minutes}3.5 minutes.
Calculate the average electric current.
Use the equation: charge flow=current×time\text{charge flow} = \text{current} \times \text{time}charge flow=current×time