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Objective: To use stated information about how four or more charged objects interact with each other in order to determine the type of charge on the objects. If you miss a question, then you will eventually be given a very similar question. You can use the Help button at any time. 
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Charge Interactions
Apprentice 4 Questions Determine the charge on three objects from four given interactions.
Pick from among the three Difficulty Levels - Apprentice, Master, and Wizard.
Master Level Completed
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Master 4 Questions Determine the charge on four objects from five given interactions.
Wizard Level Completed
Wizard 4 Questions Determine the charge on five objects from six or seven given interactions.
Apprentice Level Completed
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You have done it! You have correctly analyzed all situations for the Apprentice Difficulty Level.
You have done it! You have correctly analyzed all situations for the Wizard Difficulty Level.
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You have done it! You have correctly analyzed all situations for the Master Difficulty Level.
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Level:
#7
#6
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Apprentice Level
AA
#5
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#12
#11
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#4
#3
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#2
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#1
#10
#9
#8
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Master Level
Wizard Level