Two magnetic fields that interact with each other combine to form a single magnetic field. If the arrows on the magnetic lines of force of both magnetic fields are pointing in the same direction, the resulting magnetic field is ____. If the arrows on the magnetic lines of force are pointing in opposite directions, the resulting magnetic field is ____.
A. strengthened, weakened
B. canceled out, intensified
C. unchanged, unchanged
D. forward biased, reverse biased
Answer: A
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