Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    http://qualifications.pearson.com/co...e_20110621.pdf

    for question 6 of the paper above the answer is b but why?
    • Community Assistant
    Offline

    20
    ReputationRep:
    Community Assistant
    (Original post by runny4)
    http://qualifications.pearson.com/co...e_20110621.pdf

    for question 6 of the paper above the answer is b but why?
    It isn't actually necessary to understand the physics to answer it correctly (the hall mark of a bad question)... two of the answers would only affect the magnitude of the current in coil X and the other one would do nothing leaving only one answer remaining (B) to be correct.

    It isn't actually necessary to understand the physics to answer it correctly (the hall mark of a bad question)... two of the answers would only affect the magnitude of the current in coil X and the other one would do nothing leaving only one answer remaining (B) to be correct.Isn't there something to do with change in flux? decreasing the resistance or moving the coils closer would result in increasing magnetic flux through X while switching off the current in Y would result in decreasing flux through X leading to the induced current being in the other direction. No change would obviously do nothing.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by natninja)
    It isn't actually necessary to understand the physics to answer it correctly (the hall mark of a bad question)... two of the answers would only affect the magnitude of the current in coil X and the other one would do nothing leaving only one answer remaining (B) to be correct.

    It isn't actually necessary to understand the physics to answer it correctly (the hall mark of a bad question)... two of the answers would only affect the magnitude of the current in coil X and the other one would do nothing leaving only one answer remaining (B) to be correct.Isn't there something to do with change in flux? decreasing the resistance or moving the coils closer would result in increasing magnetic flux through X while switching off the current in Y would result in decreasing flux through X leading to the induced current being in the other direction. No change would obviously do nothing.
    oh ok thank you
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brussels sprouts
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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

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