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FAM NO. : Nov. GY 262 BPi46PM PL
Physics 8B Fal) 2002
MIDTERM 2
Section 2
Useful data:
Uy = 40x 10? TVA
1. (10 pts) A beam of unpolarized light with intensity 1500 W/m? passes through three
polarizers. The first has its polarizing axis oriented vertically, the second at 30° to
the vertical, and the third is oriented horizontally. (a) Find the intensity of the
beam after passing through all three polarizers. (b) Find the electric and magnetic
field amplitudes (the peak, not rms) of the beam after passing through all three
polarizers. (c) Suppose that the wave is propagating along the +x axis, and its
electric field at a given point in time and space is in the ty direction. What
direction does the magnetic field point in? Explain how you know.
2. (15 pts) An object is placed in front of a convex mirror. The
distance between the center of curvature of the mirror and the
mirror itself is 40.0 cm. (a) How far should the object be placed
from the mirror so that the resulting image is half the size of the
object? (b) Where would the image be? (c) Is the image real or
virtual? (d) Is it upright or inverted? (e) Locate the image
through a ray diagram. (You will only need two rays, but you
may use more to increase the accuracy of the diagram),
3. (10 pts) In the diagram, the long straight wire
carries a current of 15 A, and the rectangular
Joop carries a current of 25 A. Find the
magnitude and direction of the force exerted
on the loop by the wire.
4. (15 pts) In the diagram, at 7 = 0 the tip of the <kx%y! y
conducting triangle is just beginning to enter a Tegion
where there is a uniform magnetic field of 0.50 T into gL 4L
the page. Att = 2.05 the right end of the triangle Lye ho
enters, so that the triangle is completely in this field. 6.9
The triangle has a resistance of 0.25 Q. (a) Find the Lo eso m
flux through the triangle as a function of time. {b) Find yx x4
the current circulating in the triangle as a function of “ '
time. (c) Is the current clockwise or counterclockwise? we %h |
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