1) The picture ( located here http://i.imgur.com/vCJsHUv.jpg ) shows an end view
ID: 3900388 • Letter: 1
Question
1) The picture ( located here http://i.imgur.com/vCJsHUv.jpg ) shows an end view of a loop conducting a current whose direction is shown. The magnetic field at the loop's center points:
A) Toward us
B) Away from us
C) To the left
D) To the Right
E) Nowhere, because there is no field
F) In a direction we don't have enough information to determine
2) A wire bent in the shape shown here (picture here: http://i.imgur.com/npm16Q9.jpg ) carries a current in the direction marked. What is the magnitude B of the magnetic field at point a due to the horizontal segments of the wire?
A) (k*i)/(c*R)
B) (pi*k*i)/(c*R)
C) (pi*k*i)/(2*c*R)
D) (2*pi*k*i)/(c*R)
E) (k*i)/c
F. Zero
G. other (specify)
3) Imagine that we have a circular plastic disk of radius 20cm. By rubbing its edge with fur, we create a total negative charge of about 30 nC uniformly distributed around the disk''s edge. We then spin the disk at a rate of 60 turns per second. What is the approximate magnitude of the magnetic field that rotating charge creates at the disk's center? How does this compare to the earth's magnetic field?
Explanation / Answer
1) B) Away from us
2) C) (pi*k*i)/(2*c*R)
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