This preview shows page 1. Sign up to view the full content.
35.
In a model ac generator, a 500turn rectangular coil, 8.0 cm by 20 cm, rotates
at 120 rev/min in a uniform magnetic field of 0.60 T. (a) What is the maximum emf
induced in the coil? (b) What is the instantaneous value of the emf in the coil at
t
= (
π
/32) s? Assume that the emf is zero at
t
=
0. (c) What is the smallest value of
t
for which the emf will have its maximum value?
Solution
When a coil rotates in a uniform magnetic field, the emf induced in that coil is
given by
E
=
()
NBA
t
ωω
sin
.
Here,
N
is the number of turns on the coil,
B
is the
magnitude of the magnetic field,
A
is the area enclosed by the coil, and
ω
is the
angular frequency of the coil.
(a) The angular frequency of the coil is
=
=
120
21
4
rev
min
rad
1 rev
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 04/08/2011 for the course PHYS 1402 taught by Professor Avram during the Spring '10 term at Austin Community College.
 Spring '10
 Avram
 Physics

Click to edit the document details