Work Sheet for Static Electricity
Experiment Guide
The purpose of this experiment is to find the thermal capacity CT of the resistor. You
need to fill out the following table during the experiment. In the table, Ti is the initial
reading of the thermometer for each trial while Tmax is the maximum reading. ΔP is the
voltage applied on the capacitor which can be read from the multimeter. The capacitance
(C) of the given capacitor is 1 Farad (F). Repeat same procedures for 3 times and then
determine the average value of CT using equation ½C(ΔP)2 = CTΔT where ΔT is the
difference of Tmax and Ti. When reading the maximum temperature, read at 5 seconds
intervals until 5 consecutive readings are the same.
Trial
Ti (C˚)
Tmax (C˚)
ΔP (V)
CT (J/T)
1
2
3
Average
Exercise Problems
1. A test charge of 4 x 10–5 C is placed in an electric field. The force on it is 0.6 N at
10˚. What is the magnitude and direction of the electric field at the location of the
test charge?
2. The potential difference between two parallel plates is 60 V. The plates are 3 cm
apart. What is the magnitude of the electric field between them?
3. An oil drop weighs 1.9 x 10–14 N. It is suspended in an electric field of intensity 4
x 104 N/C. What is the charge on the oil drop?
4. A sphere has a potential difference between it and the Earth of 60 V when
charged with 3 x 10–6 C. What is its capacitance?