In LR circuit, time constant τ:
ALR
BL/R
C1/(LR)
DR/L
Answer & Solution
Correct answer: B. L/R
τ = L/R (seconds). Current grows as I = (V/R)(1 - e^(-t/τ)) toward V/R. After one time constant, current reaches 63% of max.
Related questions
When a rod moves perpendicular to a magnetic field at constant velocity, the FREE charges An LC circuit oscillates with angular frequency ω equal to:Maxwell's correction to Ampère's law introduced:A bar magnet is dropped through a vertical conducting ring. The magnet:A coil of inductance 0.5 H carries a current changing at 4 A s⁻¹. The induced EMF is:A magnetic flux through a coil changes from 4 Wb to 1 Wb in 0.3 s. The average EMF inducedEddy currents are reduced in transformer cores by:A transformer works on the principle of: