When both the inductance and resistance of a coil are doubled the value of________________?
Correct answer: A. time constant remains unchanged
- A. time constant remains unchanged
- B. initial rate of rise of current is doubled
- C. final steady current is doubled
- D. time constant is halved
Explanation
For an RL circuit, the time constant is τ = L/R. Doubling both L and R leaves L/R unchanged, although the initial current slope and final steady current each decrease.
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