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With no current flowing, the emf of a source equals the work done on the charge per unit:

ASecond
BCharge
CMetre
DKelvin
Answer & Solution
Correct answer: B. Charge
1. Work is divided by something. 2. The result is measured in volts. 3. It is per unit charge. _Source: OpenStax University Physics Volume 2, Chapter 10, Direct-Current Circuits._
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