The magnetic field strength at the north pole of a 2.0-cm-diameter, 8-cm-long Alnico magnet is 0.10 T. To produce the same field
1 answer:
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Answer:
h =12.9 w/m2 k
Explanation:
we know that thermal conductivity of air K at 0 degree celcius = 0.024 w/mk
T_S = 80 Degree celcius
temperature gradient = -43 degree C/mm = - 43*1000 / m
by fourier law
q = 1032 watt/m2
we know that from newton's law
q = h (T_s - T_∞)
1032 = h*(80 - 0)
h =12.9 w/m2 k
Answer:
<h2>The answer is 4 s</h2>Explanation:
The time taken can be found by using the formula
where
d is the distance
v is the velocity
From the question we have
We have the final answer as
<h3>4 s</h3>Hope this helps you
Answer:
The electric field carries the same mount of energy as the magnetic field
The frequency of the magnetic field is the same as the frequency of the electric field.
Explanation:
Let's analyze each option in detail:
The electric and magnetic fields have equal amplitudes. --> FALSE. In fact, the amplitudes of the electric and magnetic field are related by the equation:
where
E is the amplitude of the electric field
B is the amplitude of the magnetic field
c is the speed of light
Therefore, from the equation we see that the amplitude of the electric field is much larger than that of the magnetic field.
The electric field carries the same mount of energy as the magnetic field. --> TRUE.
The energy carried by the electric field is:
where is the vacuum permittivity.
The energy carried by the magnetic field is:
where is the vacuum permeability.
Given the following relationship:
We can write
So
which means .
The electric field carries more energy than the magnetic field. --> FALSE, because in disagreement with the calculations above.
The frequency of the magnetic field is the same as the frequency of the electric field. --> TRUE. In an electromagnetic waves, electric field and magnetic field oscillate at the same frequency.
The frequency of the electric field is higher than the frequency of the magnetic field. --> FALSE, because in disagreement with the previous statement.