Question

For an inductor in a DC circuit involving a switch that can be opened or closed,...

For an inductor in a DC circuit involving a switch that can be opened or closed, the the induced emfs in the inductor....

A) keep the current in the inductor the same as it was before the switch was opened/closed.

B) keep the voltage across the inductor the same as it was before the switch was opened/closed.

C) make sure that the current through the inductor is immediately zero if the switch is opened, and immediately not zero if the switch was closed.

D) make sure that the voltage across the inductor is always zero.

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Solution:

Answer:A) keep the current in the inductor the same as it was before the switch was opened/closed.

Inductor stores the energy in a magnetic field and tries to maintain a constant current through its windings.

Current thru the inductor is stable IL = V/R , where R is the load resistance in the circuit. ; but VL = 0 , since there is no induced EMF across it .

When the Inductor is disconnected from the power supply, the IL does not change in magnitude or direction

but VL reverses polarity and drops from 0 to a negative value.

As the energy decays thru R , the VL once again returns to 0 and IL starts decreasing and drops to 0 .

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A circuit is constructed with four resistors, one inductor, one battery and a switch as shown....
A circuit is constructed with four resistors, one inductor, one battery and a switch as shown. The values for the resistors are: R1 = R2 = 59 Ω, R3 = 89 Ω and R4 = 80 Ω. The inductance is L = 350 mH and the battery voltage is V = 12 V. The positive terminal of the battery is indicated with a + sign. 1) The switch has been open for a long time when at time t =...
A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of...
A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. What is the maximum current in the circuit? a. 2.8 A b. 2.2 A c. 2.4 A d. 3.0 A e. 3.2 A
A battery is connected to a resistor and an uncharged capacitor. The switch for the circuit...
A battery is connected to a resistor and an uncharged capacitor. The switch for the circuit is closed at t = 0 s. (Assume all circuit elements are connected in series.) (a) While the capacitor is being charged, which of the following is true? A. Current through and voltage across the resistor decrease. B. Current through and voltage across the resistor first increase and then decrease. C. Current through and voltage across the resistor first decrease and then increase. D....
An RC circuit is connected across a DC voltage source through an open switch. The switch...
An RC circuit is connected across a DC voltage source through an open switch. The switch is closed at t = 0s. Which of the following is a correct statement regarding this circuit? a) The voltage on this capacitor after two time constants is about 100% of its maximum value b) The charge on the capacitor after one time constant is about 50% of its maximum value c)The charge on the capacitor after four time constants is about 98% of...
7) A circuit consists of a capacitor (capacitance of 1μF) and a resistor (resistance 1000 Ω)...
7) A circuit consists of a capacitor (capacitance of 1μF) and a resistor (resistance 1000 Ω) in series, with a battery supplying a potential difference of 12.0 V. At time t=0 a switch is closed to allow current to flow in the circuit for the first time. Remember that the potential difference supplied by the battery ε is not the same as the potential across the capacitor ΔV unless a lot of time has elapsed. Also an RC circuit is...
A circuit is constructed with an AC generator, a resistor, capacitor and inductor as shown. The...
A circuit is constructed with an AC generator, a resistor, capacitor and inductor as shown. The generator voltage varies in time as ε = Va - Vb = εmsinωt, where εm = 120 V and ω = 779 radians/second. The values for the remaining circuit components are: R = 111 Ω, C = 351 μF. The value for L is unkown. What is known is that the voltage across the generator leads the current in the circuit by φ =...
a) When the capacitor is charged and the circuit is closed, find the condition for the...
a) When the capacitor is charged and the circuit is closed, find the condition for the current to be oscillatory. b) When the circuit is connected to an AC source V = ?0 cos??, find the voltage across the inductor and the angular frequency at which the voltage across the inductor is maximized.
A circuit is constructed with an AC generator, a resistor, capacitor and inductor as shown. The...
A circuit is constructed with an AC generator, a resistor, capacitor and inductor as shown. The generator voltage varies in time as ε =Va - Vb = εmsinωt, where εm = 120 V and ω = 651 radians/second. The values for the remaining circuit components are: R = 97 Ω, L = 114.8 mH, and C = 11.9μF. 3) What is φ, the phase angle between the generator voltage and the current in this circuit. The phase φ is defined...
An LR circuit is hooked up to a battery as shown in the figure, with the...
An LR circuit is hooked up to a battery as shown in the figure, with the switch initially open. The resistance in the circuit is R=120 Ω, the inductance is L=4.90 H, and the battery maintains a voltage of E=37.0 V. At time t=0 the switch is closed. (A)What is the current through the circuit after the switch has been closed for t=5.31E-2 s? (B)What is the voltage across the inductor after the switch has been closed for t= 5.31E-2...
An inductor made as a solenoid of 300 turn with 5.00 cm long and 1.00 x10-4...
An inductor made as a solenoid of 300 turn with 5.00 cm long and 1.00 x10-4 m^2 cross section area is connected to a 75 resistor and 12 V battery. The switch is closed at time t = 0. (a) What is the inductive time constant of the circuit? (b) Calculate the current in the circuit 250 us after the switch is closed. (c) What is the magnitude and polarity of the back emf induced by the inductor 250 us...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT