Jill stuck a piece of invisible tape down onto another piece of tape. Then she yanked the upper tape off the lower tape, and she found that this upper tape strongly repelled other upper tapes and was...

Jill stuck a piece of invisible tape down onto another piece of tape. Then she yanked the upper tape off the lower tape, and

she found that this upper tape strongly repelled other upper tapes and was charged positive. Jack ran his thumb along the

slick (upper) side of the upper tape, and the tape no longer repelled other upper tapes. Jill and Jack explained this by saying

that Jack rubbed some protons out of the carbon nuclei in the tape.

Give a critique of their explanation. If Jill's and Jack's explanation is deficient, give a physically possible explanation for

why the upper tape no longer repelled other upper tapes. Include explanatory diagrams.