A teacher places a metal can on top of an insulating foam cup and touches the side of the cup with a negatively charged rod. The setup is shown in the picture below. What will happen to the negatively charged electrons when the rod touches the foam cup? (1 point) Responses The electrons will transfer to the cup and will remain in a concentrated, negatively charged area on the cup where the rod was placed. The electrons will transfer to the cup and will remain in a concentrated, negatively charged area on the cup where the rod was placed. The electrons will transfer from the cup to the metal can, causing both cup and can to have a positive charge. The electrons will transfer from the cup to the metal can, causing both cup and can to have a positive charge. The electrons will transfer to the cup and will remain in a concentrated, positively charged area on the cup where the rod was placed. The electrons will transfer to the cup and will remain in a concentrated, positively charged area on the cup where the rod was placed. The electrons will transfer from the cup to the metal can, causing both the cup and can to have a negative charge.

Answer 1

When the negatively charged rod touches the insulating foam cup, the negatively charged electrons from the rod will transfer to the foam cup. Since the foam cup is an insulator, it will retain the excess negative charge, resulting in a concentrated area of negative charge where the rod was in contact. Therefore, the correct response is:

The electrons will transfer to the cup and will remain in a concentrated, negatively charged area on the cup where the rod was placed.