A constant electromotive force E volts is applied to a circuit containing a constant resistance R ohm in series with a constant inductance L henries. If the initial current is zero. What is the current in the circuit at any time t?

• A. \(\frac{E}{R} \left(1-e^{\frac{-Rt}{L}}\right)\)
• B. \(\frac{E}{R} \left(e^{\frac{Rt}{L}}\right)\)
• C. \(\frac{E}{L} (1-e^{RLt})\)
• D. \(\frac{E}{L} (e^{-RLt})\)