Platt, David – Homework 22 – Due: Oct 31 2005, 4:00 am – Inst: Ken Shih
1
This
printout
should
have
8
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
The due time is Central
time.
001
(part 1 of 1) 10 points
A(n) 0
.
58 m length of wire moves across a
2
.
14 T magnetic field. At what speed would
it have to move to induce an
EMF
of 13
.
1 V?
Answer in units of m
/
s.
002
(part 1 of 1) 10 points
A 135turn 5 cm square wire coil rotates about
a vertical axis at 1210 rev
/
min. The horizon
tal component of the Earth’s magnetic field
at the location of the loop is 2
.
8
×
10

5
T.
B
x
= 2
.
8
×
10

5
T
B
x
= 2
.
8
×
10

5
T
5 cm
5 cm
1210 rev
/
min
Calculate the maximum emf induced in the
coil by Earth’s field. Answer in units of mV.
003
(part 1 of 2) 10 points
The resistance of the rectangular current loop
is
R
, and the metal rod is sliding to the left.
The length of the rod is
d
, while the width of
the rails is
‘
.
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 Fall '08
 Turner
 Physics, Work, Magnetic Field, metal bar, current flow

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