Turn on thread page Beta
    • Thread Starter
    Offline

    10
    ReputationRep:


    The current in the loop is induced by a changing magnetic field. Is it increasing or decreasing?

    I think it is decreasing, but I can't really explain why.
    • Study Helper
    Offline

    21
    ReputationRep:
    Study Helper
    (Original post by PatchworkTeapot)


    The current in the loop is induced by a changing magnetic field. Is it increasing or decreasing?

    I think it is decreasing, but I can't really explain why.
    Because the question does not state whether the current is increasing or decreasing, we cannot determine whether the magnetic field is increasing or decreasing.
    Offline

    2
    ReputationRep:
    You are right. The magnetic field is decreasing. The evidence: the direction of the current in the loop.The induced field acts in the direction of the applied field to try to keep it constant.
    That's because of the Lenz' s law, as you said.
    Offline

    20
    ReputationRep:
    Lenz's law is that the induced current is in such a direction as to negate the change in magnetic flux.
    Work out the direction of the field produced by the current. This will be in the opposite direction to the change of flux.
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: March 17, 2016
The home of Results and Clearing

3,822

people online now

1,567,000

students helped last year

University open days

  1. SAE Institute
    Animation, Audio, Film, Games, Music, Business, Web Further education
    Thu, 16 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Fri, 17 Aug '18
  3. University of Bolton
    Undergraduate Open Day Undergraduate
    Fri, 17 Aug '18
Poll
Will you be tempted to trade up and get out of your firm offer on results day?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.