When a Current Is Induced by a Changing Magnetic Field

Multiple Choice

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 stronger magnetic field than B₁ alone.
C) B₁ and B₂ combine to give a weaker 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.