Particle detectors and Flemming LH rule

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The discussion revolves around using Fleming's Left-Hand Rule (LHR) to determine the direction of current and force in particle detectors. The user is confused about two scenarios: one where the current is upward and the force is to the left, and another where the current is to the right and the force is upward. Clarification is sought on which scenario to apply and the reasoning behind it. The user also expresses uncertainty about the charge, suggesting it is positive. Understanding the application of Fleming's LHR is crucial for solving related problems effectively.
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Homework Statement


http://www.thestudentroom.co.uk/attachment.php?attachmentid=118892&d=1329155852

(the most important aspect is the CHARGE)

Homework Equations




The Attempt at a Solution


so we know that the first finger (using flemming LHR) is into the page
but there are two possibilities:
(a) current up and force left
OR
(b) current right and force up

WHICH one would I use and why?
I have never really been able to distinguish the two from each other with regards to LH rule in questions like this

thanks
 
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btw I think C is +ive
who agrees?
 
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