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The ( negatively / positively ) charged balloon induces the movement of electrons within the two soda cans.​

Sagot :

Explanation:

The negatively charged balloon (from rubbing against hair) will repel the electrons of paper/water/aluminum cans away from the spot closest to the balloon, resulting in a positive charge on the paper/water/aluminum can. The negatively charged balloon then attracts the induced positive charge on the neutral material.