In a classroom on the first spaceship to an extrasolar planet--there are children because the trip will take 200 years--a teacher is showing charge Q uniformly distributed along a conducting rod of length L0 to produce linear charge density ?0. As observed on Pluto when the spaceship passes it at 0.800c, the linear charge density 
is
A. 0.360 ?0.
B. 0.600 ?0.
C. 0.800 ?0.
D. 1.00 ?0.
E. 1.67 ?0.
Answer: E
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