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physgrl
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Homework Statement
A flat coil of wire has an area of 0.010 m2and contains 100 turns. Initially the coil is oriented so that the normal to its surface is parallel to a downward constant magnetic field of 0.2 T. The coil is then rotated clockwise through an angle of 30oin a time of 0.10 s. What is the average induced emf? (Note: the initial emf is zero)
a. 0.50 V
b. 0.45 V
*c. 0.18 V
d. 0.25 V
Homework Equations
emf=-Δ[itex]\Phi[/itex]B/Δt
[itex]\Phi[/itex]B=N*ABcos(θ)
The Attempt at a Solution
emf=-Δ[itex]\Phi[/itex]B/Δt
emf=-N*AB(cos(θ1)-cos(θ2))/Δt
emf=-100*0.01m2*.2T(cos(0)-cos(30))/.1s
emf=2.7x10-2V
the answer appears to be .18V...can someone tell me why is this? thanks!