Interaction between matter and electromagnetic radiation can be observed by subjecting a substance to magnetic fields in which of the following manner?

Interaction between matter and electromagnetic radiation can be observed by subjecting a substance to magnetic fields in which of the following manner? Correct Answer One field should be stationary and the other should be varying

Interaction between matter and electromagnetic radiation can be observed by subjecting a substance to two magnetic fields. One magnetic field must be stationary and the other field must be varying at some radio frequency.
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