Which of the following best describes why we say that light is an electromagnetic wave?
1 answer:
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Answer:
The observer sees the space-probe 9.055m long.
Explanation:
Let be the length of the space-probe when measured at rest, and
be its length as observed by an observer moving at velocity
, then
Now, we know that and
, and putting these into
we get:
Thus, an observer moving at 0.95c observes the space-probe to be 9.055m long.
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1) First of all, since we know the radius of the wire (
), we can calculate its cross-sectional area
2) Then, we can calculate the current density J inside the wire. Since we know the current,
, and the area calculated at the previous step, we have
3) Finally, we can calculate the electric field E applied to the wire. Given the conductivity
of the aluminium, the electric field is given by
1) First of all, since we know the radius of the wire (
2) Then, we can calculate the current density J inside the wire. Since we know the current,
3) Finally, we can calculate the electric field E applied to the wire. Given the conductivity