A class of students performed the heat transfer experiment shown in the picture. In the experiment, three plastic dishes were pa
rtially filled with equal amounts of dark soil, light soil, and water. Thermometers were placed in each dish, and the dishes were placed under a heating lamp. The substances were left under the heating lamp for ten minutes, and their temperatures were observed and recorded. After recording the temperatures of the substances as they were heating, the students turned the lamp off and recorded the temperatures of the substances as they cooled for ten minutes.
Which method of heat transfer is illustrated in this experiment? Explain your answer
Which method of heat transfer is illustrated in this experiment? Explain your answer
1 answer:
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Answer
current density is given by
where J = σ E
now,
a) Electric field strength at the inner surface of an iron cylinder
a = 0.5 cm = 0.005 m b = 2.3 = 0.023
L = 10 cm = 0.1 m I = 27 A
E = 8.59 x 10⁻⁴ V/m
b) Electric field strength at the outer surface of an iron cylinder
a = 0.5 cm = 0.005 m b = 2.3 = 0.023
L = 10 cm = 0.1 m I = 27 A
E =1.87 x 10⁻⁴ V/m
Answer:
The magnitude of the electric field are and
Explanation:
Given that,
Radius of inner shell = 11.0 cm
Radius of outer shell = 14.0 cm
Charge on inner shell
Charge on outer shell
Suppose, at r = 11.5 cm and at r = 20.5 cm
We need to calculate the magnitude of the electric field at r = 11.5 cm
Using formula of electric field
Where, q = charge
k = constant
r = distance
Put the value into the formula
The total charge enclosed by a radial distance 20.5 cm
The total charge is
Put the value into the formula
We need to calculate the magnitude of the electric field at r = 20.5 cm
Using formula of electric field
Put the value into the formula
Hence, The magnitude of the electric field are and