Salmon often jump waterfalls to reach their breeding grounds. One salmon starts 2m from a waterfall that is 0.55m tall and jumps
1 answer:
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The resistance of a conductor is given by:
where
is the resistivity of the material
L is the length of the conductor
A is its cross-sectional area
We can use this formula to solve both parts of the problem.
a) The length of the copper wire is L=1.0 m. Its diameter is d=0.50 mm, so its radius is
And its cross-sectional area is
The copper resistivity is
, therefore the resistance of this piece of wire is
b) The length of this piece of iron is L=10 cm=0.10 m. Its cross-sectional size is L=1.0 mm=0.001 m, so its cross-sectional area is
The iron resistivity is
, therefore the resistance of this piece of wire is
where
L is the length of the conductor
A is its cross-sectional area
We can use this formula to solve both parts of the problem.
a) The length of the copper wire is L=1.0 m. Its diameter is d=0.50 mm, so its radius is
And its cross-sectional area is
The copper resistivity is
b) The length of this piece of iron is L=10 cm=0.10 m. Its cross-sectional size is L=1.0 mm=0.001 m, so its cross-sectional area is
The iron resistivity is
Answer:
The magnetic field in the region a < r < b is
Explanation:
If we have the a < r < b. The formula of current is:
Where:
A = area enclosed by the loop.
Itotal = total current in loop.
If we have the Ampere`s law: