Exam 2 key

What fraction of the original unpolarized light is

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Unformatted text preview: drop it from rest at a height of 10 km. Assume that there is no atmosphere to create drag. The rod remains horizontal all the way down to the ground and hits the ground flat in an East ­West orientation. At the ground the magnetic field is 50 Gauss (0.005 Tesla) and is also horizontal since it is pointing North. What is the induced voltage across the rod’s length just as it hits the ground? A. 19 mV B. 430 mV C. 2.2 V D. 7.3 V v 2 = 0 + 2 g(10000 m ) ! v = 2(9.8 m / s 2 )(10000 m ) = 443m / s Vinduced = B!v = (0.005T )(1m )( 443m / s ) = 2.2V 14. In class you saw a demonstration wherein unpolarized light was sent through two crossed polarizers and allowed no light through (when two linear polarizers are crossed at 90°, no light gets through, and the fraction transmitted is 0%). A third polarizer is inserted between the other two a...
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