This question is about electrostatic charging and the flow of electric charge.
Describe how a student charges an acetate rod using a dry silk cloth.
After being rubbed, the acetate rod becomes positively charged. Describe what happens to the charges on the rod as it becomes positively charged.
Explain why this positively charged rod is attracted to a negatively charged sphere.
High-voltage static electricity can discharge as a spark. In a laboratory experiment, the potential difference between a Van de Graaff generator dome and an earthed sphere is 1.5×105 V1.5 \times 10^5\text{ V}1.5×105 V. When a spark jumps between them, 4.5 J4.5\text{ J}4.5 J of energy is transferred. Calculate the amount of charge which flows during the spark discharge. Use the equation: energy transferred=charge×potential difference\text{energy transferred} = \text{charge} \times \text{potential difference}energy transferred=charge×potential difference
Calculate the charge flow in an industrial electroplating cell when there is a current of 8.5 A8.5\text{ A}8.5 A for 4.5 minutes4.5\text{ minutes}4.5 minutes. Use the equation: charge flow=current×time\text{charge flow} = \text{current} \times \text{time}charge flow=current×time