1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Electromagnetic Induction and aircraft wing

  1. Jun 11, 2008 #1
    1. The problem statement, all variables and given/known data

    4) The wing of an aircraft is 60m long and the aircraft is travelling at 250ms-1. The vertical component of the Earth’s magnetic field, which the wing is cutting, has the value of 4.3 X 10-5 T.
    a. The Flux cut per second by the wing
    b. The induced emf set up across the wing

    2. Relevant equations
    This s the equation given:
    E = N D Φ /Dt

    3. The attempt at a solution
    Heres my attempt. My answers seem very wrong. Please help. Thanks.

    a. The Flux cut per second by the wing
    Magnetic field = 4.3 X 10-5 T
    Length of conductor = 60m
    Velocity = 250ms-1
    E = Ф ÷ t
    E = (4.3 X 10-5 X 60) ÷ 250 = 103 X 10-7 T

    b. The induced emf set up across the wing
    E = BLV
    E = Induced EMF
    B =Flux density
    V = Velocity

    E = 4.3 X 10-5 X 60 X 250 =0.645.
    Last edited: Jun 11, 2008
  2. jcsd
  3. Jun 11, 2008 #2


    User Avatar
    Homework Helper

    Hi Sabrina_18,

    You're right that the thing you are looking for is flux/time. However, that will have units of T m^2 / s. What are the units of your calculation above (doing field times length over speed)? (You don't just get tesla.) Once you carry the units through your calculation, I think you'll see what you did wrong. What do you get?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook