When a current is induced by a changing magnetic field B1, the current always produces a second magnetic field B2 such that
A. B1 and B2 completely cancel each other out.
B. B1 and B2 combine to give a weaker magnetic field than B1 alone.
C. B1 and B2 combine to give a stronger magnetic field than B1 alone.
D. It is not possible to tell whether the combined field is stronger or weaker than B1 without knowing how B1 is changing
Answer: D
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