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physics

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Consider a circuit with an RL series with L=0.09 H and R=0.05 Ohm. At t=0 the circuit is connected to a battery which provides V0=12 V.

(a)How long does it take to the current to equal a fraction 0.95 of the steady state current?

(b) What is the energy stored (in Joules) in the magnetic field when the current equals a fraction 0.95 of the steady state current?

(c) What is the total energy delivered (in Joules) by the battery up to the time t found in part (a) ?

(d) How much energy (in Joules) has been dissipated in the resistor?

  • physics -

    I = E/R = 12/0.05 = 24q Amps = Steady-state current.

    0.95I = 0.95 * 240 = 228A.

    Vr + Vc = 12 Volts
    228*00.05 + Vc = 12
    Vc = 12-11.4 = 0.6 Volts = Voltage across coil when i = 0.95I steady-state

    a. Vc = 12/e^(t/T) = 0.6
    e^(t/T) = 12/0.6 = 20
    t/T = Ln20 = 3.0
    T = L/R = 0.09/0.05 = 1.8 s.
    t/1.8 = 3
    t = 5.4 s.


    c. Energy = E*I*t = 12*228*5.4=14,774.4
    Joules.

    d. Energy = I^2*R*t = (228)^2*0.05*5.4 =
    14,036 Joules.

  • physics -

    Plz answer b part......(C) n (d) part are wrong !

  • physics -

    wrong answer

  • physics -

    please abdul answer of this question.

  • physics -

    All of the answers are wrong! Please help!

  • physics -

    sorry answer a) seems right the rest appears wrong though. Anyone for b),c),d)?

  • physics -

    plz do u hav answers for other edx HW Q's ????

  • physics -

    Did you figure the above problem out Abdul?
    Thank

  • physics -

    I got d) 8165
    you multiply 12/0.09
    and than apply what Henry provided for answer c) 12*126*5.4=8165
    It seems the numbers are getting mixed up, can someone figure out b) and c) with it?
    thanks

  • physics -

    I meant divide 12/0.09 and then multiply the result by 0.95 which is approx. 126

    b) and c) anyone?

  • physics -

    ANyone for Problem 2: Displacement Current a) please?
    b) 0

    Open Switch on an RL Circuit
    b) and c) please?

  • physics -

    flu do u hav answers for Q2 part a
    Q3 part b and part c, Q5 and Q7 all parts ???

  • physics -

    Anyone for this please?

    Problem 2: Displacement Current a) please?


    Problem: Open Switch on an RL Circuit
    b) and c) please?

  • physics -

    Yes, please the question below too?!

    Problem 2: Displacement Current a)

    Problem: Open Switch on an RL Circuit
    b) and c)

  • physics -

    Please help!

  • physics -

    Can somebody help with Problem: Displacement Current please?

    I thought the formula is:
    (1.25663706*10^-6*0.04*0.2*0.0705)/(2*pi*0.05^2)

    However, I am not getting the correctr answer.

  • physics -

    i need only the c1

  • physics -

    C2: integral 1 to 5.4 of (12/0.05)^2)* (1-e^(-(0.05 t)/0.09))^2 * 0.05 dt

    C1: B + C2

  • physics -

    remember that E=1/2.L.I² for b)

  • physics -

    Anybody figure out c)?

  • physics -

    Anyone for Problem
    Opening a Switch on an RL Circuit

    c) please?

  • physics -

    Flu > ev give you the answer d (just integrate what he wrote)

    now you have d) you have just to do answer c) = b) + d)

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