Some physics students are conducting an experiment investigating both electrostatic and gravitational forces. They suspend two equally charged balls, each of mass 4.0 g, from light, non-conducting strings suspended from a low ceiling.
The charged balls repel each other with the strings at an angle of 60°, as shown in Figure 1.
There are three forces acting on each ball:
-
- a tension force,
- a gravitational force,
- an electrostatic force,
.
- a tension force,
- On Figure 1, using the labels
and , draw each of the three forces acting on each of the charged balls. (3 marks)
--- 0 WORK AREA LINES (style=lined) ---
- Show that the tension force,
, in each string is . Use . - Show your working. (2 marks)
--- 5 WORK AREA LINES (style=lined) ---
- Calculate the magnitude of the electrostatic force,
. Show your working. (2 marks)
--- 6 WORK AREA LINES (style=lined) ---