The rate of rise of current through an inductive coil is maximum_____________?
Correct answer: B. at the start of the current flow
- A. at 63.2% of its maximum steady value
- B. at the start of the current flow
- C. after one time constant
- D. near the final maximum value of current
Explanation
At the instant a DC voltage is applied, an inductor opposes any sudden change in current, but the current slope is initially maximum because di/dt = V/L. The slope then decreases as the current approaches its steady value.
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