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Example 2: A coil has 200 turns of area 30 cm 2 .<br />
It flips from vertical to horizontal position in a<br />
time of 0.03 s. What is the induced emf if the<br />
constant B-field is 4 mT?<br />
A = 30 cm 2 – 0 = 30 cm 2<br />
F = B A = (3 mT)(30 cm 2 )<br />
F = (0.004 T)(0.0030 m 2 )<br />
N<br />
N = 200 turns<br />
n<br />
q<br />
B<br />
S<br />
F = 1.2 x 10 -5 Wb<br />
B = 4 mT; 0 0 to 90 0<br />
E<br />
N<br />
F<br />
t<br />
-5<br />
1.2 x 10 Wb<br />
(200)<br />
0.03 s<br />
E = -0.080 V<br />
The negative sign indicates the polarity of the voltage.
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