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Erik Strand
pit
Commits
4ba91548
Commit
4ba91548
authored
6 years ago
by
Erik Strand
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Fix relative URL issue
parent
9e1970e3
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_psets/10.md
+4
-4
4 additions, 4 deletions
_psets/10.md
_psets/11.md
+5
-5
5 additions, 5 deletions
_psets/11.md
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9 deletions
_psets/10.md
+
4
−
4
View file @
4ba91548
...
...
@@ -179,10 +179,10 @@ coercivity of iron is $$\num{4e3} \si{A/m}$$.
Approximately what current would be required in a straight wire to be able to erase a $$
\g
amma
\t
ext{-} Fe_2 O_3$$ recording at a distance of 1 cm?
As found in problem 6.4 in
[
problem set 4
](
/psets/
04.html
)
, the magnitude of the magnetic field a
distance
$$r$$ away from an infinitely long and thin conductor carrying a current $$I$$ is $$I/(2
\p
i r)$$.
To erase information stored on $$Fe_2 O_3$$ we need this field to be about as strong as
the
coercivity $$H_C = 300
\s
i{Oe}$$. Thus the current needed is
As found in problem 6.4 in
[
problem set 4
](
04.html
)
, the magnitude of the magnetic field a
distance
$$r$$ away from an infinitely long and thin conductor carrying a current $$I$$ is $$I/(2
\p
i r)$$.
To erase information stored on $$Fe_2 O_3$$ we need this field to be about as strong as
the
coercivity $$H_C = 300
\s
i{Oe}$$. Thus the current needed is
$$
\b
egin{align
*
}
...
...
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_psets/11.md
+
5
−
5
View file @
4ba91548
...
...
@@ -25,11 +25,11 @@ determine the current, relate the measurement to fundamental constant(s).
If a SQUID with an area of $$A = 1 cm^2$$ can detect 1 flux quantum, how far away can it sense the
field from a wire carrying 1 A?
As found in problem 6.4 in
[
problem set 4
](
/psets/
04.html
)
, the magnitude of the magnetic field a
distance
$$r$$ away from an infinitely long and thin conductor carrying a current $$I$$ is $$I/(2
\p
i r)$$.
One flux quantum is $$
\n
um{2.07e-7}
\s
i{G
\c
dot cm^2}$$ i.e. $$
\n
um{2.07e-11}
\s
i{T
\c
dot
cm^2}$$.
So to get one flux quantum over $$1
\s
i{cm^2}$$, we need a magnetic field of
$$
\n
um{2.07e-11}
\s
i{T}$$. Thus a one amp current can be detected at a distance of
As found in problem 6.4 in
[
problem set 4
](
04.html
)
, the magnitude of the magnetic field a
distance
$$r$$ away from an infinitely long and thin conductor carrying a current $$I$$ is $$I/(2
\p
i r)$$.
One flux quantum is $$
\n
um{2.07e-7}
\s
i{G
\c
dot cm^2}$$ i.e. $$
\n
um{2.07e-11}
\s
i{T
\c
dot
cm^2}$$.
So to get one flux quantum over $$1
\s
i{cm^2}$$, we need a magnetic field of
$$
\n
um{2.07e-11}
\s
i{T}$$. Thus a one amp current can be detected at a distance of
$$
\b
egin{align
*
}
...
...
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