Physics 1425: General Physics I - Galileo and Einstein
Physics 1425: General Physics I - Galileo and Einstein
Physics 1425: General Physics I - Galileo and Einstein
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Ampère’s Law at Time t<br />
• As soon as the exp<strong>and</strong>ing<br />
magnetic field reaches our<br />
loop, Bd<br />
0LI<br />
<strong>and</strong> there<br />
can be no further change in<br />
the perpendicular electric<br />
field.<br />
• This means the electric field E<br />
is spreading right along with<br />
the magnetic field, at v, so<br />
• .<br />
(No B-field out here yet.)<br />
dE<br />
/ dt 2EvL<br />
<strong>and</strong> from<br />
0 00<br />
we find for field strengths B <br />
I /2<br />
vE<br />
vt<br />
vt<br />
(No B-field out here yet.)<br />
B-field<br />
0 Bd LI dE<br />
/ dt<br />
0 0 0
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