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Pre-class Quiz

Read: Griffiths Ch.7 (7.1.1.)

Question 1 The figure shows conduction electrons moving leftward in a wire.

Are the following leftward or rightward?
a) the current I?
b) the current density J?
c) the electric field E in the wire?
Question 2 Three copper rods have the follwing dimensions and potential differences between their ends:
Rod 1: Length L, Diameter 3d, Potential Difference V,
Rod 2: Length 2L, Diameter d, Potential Difference 2V,
Rod 3: Length 3L, Diameter 2d, Potential Difference 2V.
Which rod has the largest current density within it?