A student holds a rod in her hand. She rubs the rod with a cloth. The rod becomes positively charged, and the cloth becomes negatively charged.
Which row shows whether the rod is an insulator or a conductor, and which charges move while the rod is rubbed with the cloth?
1 )
rod: conductor / charges that move: negative
2 )
rod: conductor / charges that move: positive
rod: insulator / charges that move: negative
4 )
rod: insulator / charges that move: positive
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