50.0 2 12.0 mH 20.0 V 18.0 mH 25.0 2 15.0 mH 0000
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In the circuit shown in
Fig. , the switch S has been open
for a long time and is suddenly closed.
Neither the battery nor the inductors
have any appreciable resistance. What
do the ammeter and the voltmeter read
(a) just after S is closed; (b) after S has
been closed a very long time; (c) 0.115
ms after S is closed?
Given data:
- The resistance is .
- The resistance is .
- The voltage is .
- The inductance is .
- The inductance is .
- The inductance is .
- The time is .
Since and are in series. Thus, the equivalent inductance will be:
Since is in parallel connection with . Thus, the equivalent inductance will be:
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- A transformer is to be used to provide power for a computer disk drive that needs 5.6 V (rms) instead of the 120 V (rms) from the wall outlet. The number of turns in the primary is 420, and it delivers 500 mA (the secondary current) at an output voltage of 5.6 V (rms). (a) Should the transformer have more turns in the secondary compared to the primary, or fewer turns? O There should be more turns in the secondary. O There should be fewer turns in the secondary. (b) Find the current in the primary. (c) Find the number of turns in the secondary. turnsIn the RL circuit shown below, it takes 1.5 seconds after the switch is closed for the current to reach half of its steady-state value. If the inductor was replaced with an inductor with twice the inductance and the experiment was run again from the beginning, how long would it take for the current to reach half of its steady-state value?Time t < 0, the circuit is in DC Steady State. The switch is opened instantly at time t=0. This question deals with the new initial conditions for t>0. When t<0, I₂ = 7 A, and I₃ = 9 A. Give I₂ at t=0+ (at t=0, but after the switch is opened).
- An inductor consists of 100 turns of wire tightly wound about an insulating core. It is attached to a power supply and when the current through it is increased from 0 to 5 A in 3, s an induced emf of 5 V is measured. Find the inductance of this device and the magnetic flux and the energy stored in the magnetic field when the current is held steady at 5 A.The circuit was in DC steady state for t < 0. A quantity absolutely cannot change suddenly in this circuit, and in general unless nothing else can happen. It must be continuous across the switch opening. Which is that quantity? (The battery voltage also remains constant; that's not the answer I'm looking for.) Please see photos for more detailsℇ = 100 V, R = 20.0 Ω, and L = 100.0 mH. The switch is closed att = 0. (a) What is the time constant of the circuit shown below? (b) Find the currentat t = 0.050 sec, (c) at what time the current is 40% of its maximum value?
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