1. Not finding help here? Sign up for a free 30min 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!

Production of electric current

  1. Jul 31, 2006 #1
    In which of the following situations is an electric current not produced?
    a. a loop of wire rotates in a steady magnetic field
    b. a loop of wire is stationary in a steady magnetic field
    c. the magnetic field through the loop is increasing
    d. the magnetic field through the loop is decreasing


    Ok-I know that if you change hte magnetic field then the flux would change, and therefore produce an electric current, so I think its safe to say that c an d d are both wrong. But I have no clue how the wire's movement/lack of movement in a steady magnetic field would change things....can someone help me understand that?

    thank you!
     
  2. jcsd
  3. Jul 31, 2006 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    Remember, the flux is the dot product of B and A: [itex]\phi = \vec{B}\cdot\vec{A} = BAcos\theta[/itex]

    Does this change when the loop is stationary in a stationary field? Does it change when the loop rotates in a stationary B field (ie. the angle between B and A continually changes)?

    AM
     
  4. Jul 31, 2006 #3
    Suppose that the magnetic field is vertical upward.
    Suppose you have a round loop in a horizontal plane.
    Now rotate the loop along an axis wich is horizontal.
    What will happen to the flux of the magnetic field through the loop?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Production of electric current
  1. Current Electricity (Replies: 4)

  2. Electric current . (Replies: 2)

  3. Current electricity . (Replies: 6)

  4. Electric Current (Replies: 6)

  5. Current electricity (Replies: 7)

Loading...