physics right hand rule

[Pediateix]

i usually figure out the right hand rule. I've use the three fingers
http://www.aplusphysics.com/courses/honors/magnets/images/3rdRHR.png


but in this problem, they are using it kind of differently, and I've never done a right hand rule with clockwise or center clockwise, can you do it with the three fingers. ? how

this is from kaplan, but the question is here

MCAT Physics Question 74: Answer and Explanation_maintests.com

thank you 🙂)

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[aldol16]

There are several ways to do the right-hand rule - just find a way that works for you and do it. If you got the right answer another way, then your way is fine.

 

[Pediateix]

yea. i just don't understand the three way fingers. and for this question, how do you know protein x alters the permeability. i can't find any evidence in the passage