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**Experiment Guide **

The purpose of this experiment is to find the thermal capacity C

T

of the resistor. You need to fill out the following table during the experiment. In the table, T i

is the initial reading of the thermometer for each trial while T max

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 C

T using equation ½C(ΔP) 2

= C

T

ΔT where ΔT is the difference of T max

and T i

. When reading the maximum temperature, read at 5 seconds intervals until 5 consecutive readings are the same.

Trial T i

(C˚)

T max

(C˚) ΔP (V)

C

T

(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 10 4 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?