Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points directly away from the nearest point on the y axis and has a magnitude that depends only on r, the distance to that nearest point. For which of the gaussian surfaces listed, would it be easiest to calculate the net flux of the electric field through that surface?
A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis.
B. A spherical surface.
C. A cylindrical can-like surface oriented with its central axis perpendicular to the y axis.
D. A cylindrical can-like surface oriented with its central axis parallel to the y axis.
E. A cone-like surface oriented with its central axis parallel to the y axis.
D. A cylindrical can-like surface oriented with its central axis parallel to the y axis.
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A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 30° above the horizontal. What is the angular acceleration of the rod at the instant it is released?
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