Which of the following particles are leptons? (There may be more than one correct choice.)
A) protons
B) neutrons
C) electrons
D) photons
E) quarks
Question 2
Two uncharged metal spheres, 1 and 2, are mounted on insulating support rods. A third metal sphere, carrying a positive charge, is then placed near 2. Now a copper wire is momentarily connected between 1 and 2 and then removed.
Finally, sphere 3 is removed. In this final state A) spheres 1 and 2 are still uncharged.
B) sphere 1 carries positive charge and 2 carries negative charge.
C) sphere 1 carries negative charge and 2 carries positive charge.
D) spheres 1 and 2 both carry positive charge.
E) spheres 1 and 2 both carry negative charge.
This girl has a long leg cast, which was applied after surgery to correct her clubfoot.
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