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1 answer:
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This question involves the concepts of induced emf and magnetic field.
The wire has to move at a speed of "20 m/s".
<h3>Speed of Wire</h3>The emf induced in a current carrying conductor when it passes through a magnetic field is given by the following formula:
where,
- v = speed = ?
- E = induced emf = 10 volts
- B = magnetic field = 2.5 T
- l = length of wire = 0.2 m
Therefore,
v = 20 m/s
Learn more about induced emf here:
#SPJ1
Answer:
Thickness is 0.086 ft
Solution:
iAs per the question:
Temperature, T =
Energy to be stored, E = 150000 Btu
Area of the concrete floor, A =
Density of concrete,
The heat energy is given by:
(1)
Also, we know that:
1 Btu = 1055 J
where
= density
m = Mass
V = Volume
A = Area
t = thickness
s = 750 Jk/kg
Now, eqn (1) can be written as:
Thickness can be written as:
t = 0.02625 m
t =