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Correct! Electric; oppositely charged pith balls exert an electric force of attraction on each other.
Incorrect, please try again.
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Correct! Magnetic; the electric current in the wire creates a magnetic field which exerts a magnetic force of attraction on the paper clips.
Incorrect, please try again.
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Correct! Electric; static electric charges, possibly generated by the cat playing in the box and rubbing against the Styrofoam.
Incorrect, please try again.
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Correct! Electric; oppositely charged atoms exert an attractive electrical force on each other.
Incorrect, please try again.
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Source: Pith Balls Attracting, The University of Michigan Physics
Source: Electromagnet 4, Weird Science Kids
Image adapted from: funny-pictures-cat-has-static-cling, Kevin Jarrett, Flickr
Source: ch1_bonds, National Institute of General Medical Sciences