A) The magnetic poles always exist as unlike pairs of equal strength.
B) If several magnetic lines of force enter in a closed surface, then an equal number of lines of force must leave that surface.
C) There are abundant sources or sinks of the magnetic field inside a closed surface.
D) Isolated magnetic poles do not exist.
Correct Answer: C
Solution :
(c) There are abundant sources or sinks of the magnetic field inside a closed surface. Gauss' law indicates that there are no sources or sinks of the magnetic field inside a closed surface. In other words, there are no free magnetic charges.
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