When a battery is being charged, the p.d. across it is:

  1. equal to zero
  2. equal to its e.m.f. always
  3. less than its e.m.f.
  4. greater than its e.m.f.
Answer

D) greater than its e.m.f.

Extra energy is needed to drive current backwards through its internal resistance. SLO P-09-E-16 · Understanding

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