All Problems

Electromagnetic Induction. Maxwells Equations

Problem 3.317

A coil of inductance \(L=300 \mathrm{mH}\) and resistance \(R\) \(=140 \mathrm{~m} \Omega\) is connected to a constant voltage source. How soon will the coil current reach \(\eta=50 \%\) of the steady-state value?

Reveal Answer
t=−LRln⁡(1−η)=1.5 st=-\frac{L}{R} \ln (1-\eta)=1.5 \mathrm{~s}
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