An electrostatic paint sprayer is used to spray paint onto a metal bicycle frame.
The paint droplets leave the sprayer with a negative charge. The bicycle frame is grounded (connected to 0 V0\text{ V}0 V), which acts as a positive electrode relative to the charged droplets.
Explain how the electrostatic paint sprayer ensures that the bicycle frame gets an even coat of paint on all sides, including those facing away from the sprayer. Use ideas about electrostatic charges.
Suggest why using an electrostatic paint sprayer is better for the environment than using a conventional paint sprayer.
The paint sprayer operates using a high-voltage power supply. Why are high voltages dangerous?
During a test run, the sprayer nozzle transfers 540 C540\text{ C}540 C of charge every 1.5 minutes1.5\text{ minutes}1.5 minutes.
Calculate the current.
Use the equation: $\text{charge flow} = \text{current} \times \text{time}$
Static and charge Questions
Practise OCR GCSE Physics Static and charge with exam-style questions for Foundation and Higher tier. 29 questions, matched to the OCR GCSE Physics (J249) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.