ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: sahil26 on October 11, 2012, 10:52:02 pm
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This sort of question always trips me up. So can someone explain how this works?
A vertical rod is moved, towards the right edge of the page, through a magnetic field pointing out of the page.
Which end of the rod is positive and which end is negative?
If the rod was used to complete a circuit and moved through the field, which way would the current flow?
Thank you in advance :)
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use the right hand slap rule:
index is mag.field, thumb is direction of positive particles movement, and middle finger/palm induced force/current. Note that it is always conventional current and positive particles
in ur example, index would point towards yourself, thumb to the right, so conventional current would flow downwards if a circuit is connected. When there is no circuit, the bottom will be positive and top will be negative.
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Ok I think this is how you do it.
A change in flux is created by moving the rod to the right, so in order to oppose this change a force ,ust be created to move it to the left. Using the right hand slap rule with your middle finger pointing into the page and palm facing the left, you will find that your thumb is facing up. So thedirection of the current is up the rod.
Edit. Misread the question. I thought the field was into the page so the current is downwards as Phantom explained above.