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Directions of Forces<br />
and EMFs<br />
An emf E is induced by<br />
moving wire at velocity v<br />
in constant B field. Note<br />
direction of I.<br />
x x x x x x x x x<br />
x x x x x x I x x<br />
x x x x x x x x x<br />
x x I x x x x<br />
v<br />
x<br />
vx<br />
x x x x x Lx x x x<br />
x x x x x x x x<br />
x x x x x x x x x<br />
x<br />
From Lenz’s law, we see<br />
that a reverse field (out) is<br />
created. This field causes a<br />
leftward force on the wire<br />
that offers resistance to the<br />
motion. Use right-hand<br />
force rule to show this.<br />
I<br />
B<br />
v<br />
Induced<br />
emf<br />
x x x<br />
x x<br />
x x x<br />
x x<br />
x x x<br />
x x<br />
x x x<br />
Lenz’s law<br />
I<br />
v<br />
B
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