Induced electric field from changing current · CAP 2013 #3
Physics · electromagnetism
Problem
A long, straight wire carries a current that decreases linearly with time. What is the direction of the induced electric field outside the wire?
a) Parallel to the current in the wire, in the same direction.
b) Parallel to the current in the wire, in the opposite direction.
c) Pointing radially outward from the wire.
d) Pointing radially inward toward the wire.
e) There is no induced electric field outside the wire.