Engineering Board Exam Reviewer · Time Response of Reactive Circuits · medium
How much energy is stored in the magnetic field of a 2 H inductor carrying 0.5 A?
- 0.5 J
- 1 J
- 0.25 J
- 0.125 J
Answer
C. 0.25 J
Solution
W= 12LI2= 12(2)(0.5)2=0.25 J.
More Time Response of Reactive Circuits questions
- How much energy is stored in a 100, F capacitor charged to 24 V?
- The curve shows the capacitor voltage after a switch connects an uncharged capacitor in series with a 2 k resistor to a dc source. The…
- The switch in the RL circuit shown closes at t=0 with no initial current (V=6 V, R=100, , L=200 mH). Find the voltage across the inductor…
- The switch in the RL circuit shown closes at t=0 with no initial current (V=24 V, R=40, , L=4 H). Find the current at t=100 ms.
- The capacitor shown is charged to 50 V when the switch closes at t=0 and discharges through R=20 k (C=22, F). Find the capacitor voltage…
- The switch in the circuit shown closes at t=0 with the capacitor uncharged (V=48 V, R=10 k , C=2, F). Find the circuit current at t=60 ms.
- The capacitor in the circuit shown is initially uncharged and the switch closes at t=0 (V=48 V, R=2 k , C=10, F). How long does it take…
- The switch in the circuit shown closes at t=0 with the capacitor initially uncharged (V=24 V, R=20 k , C=500 nF). Find the capacitor…
- At the instant a switch connects an uncharged capacitor to a dc voltage source through a resistor, the capacitor behaves like a
- What percentage of its final value has a charging capacitor voltage reached after one time constant?