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- I am curious about the case where two electric or magnetic fields cancel each other out. If a charged particle travels through the region where the cancellation exists, does that area still have electric field energy density?

I am curious about the case where two electric or magnetic fields cancel each other out (I'm assuming this is possible). If a charged particle travels through the region where the cancellation exists, I am assuming the particle behaves as if no field exists. Does that area still have electric field energy density? Should it be understood that there is *no* electric field or is there twice as much energy density, but the two fields are fighting for control of the charged particle and the net force cancels out?