If the direction of the generator direct current (Fig. , a) coincides with the direction of the emf. battery, then the energy of the latter decreases. If these quantities are opposite in direction to each other, as is the case when charging a battery, then the energy of the battery increases. Will these statements remain valid if the battery (Fig. , b) is replaced with a self-induction coil that accumulates magnetic energy, and the generator is equipped with a rheostat to change the current strength.

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