Question

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 from the cup to the metal can, causing both the cup and can to have a negative charge.
The electrons will transfer from the cup to the metal can, causing both the cup and can to have a negative 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 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.

Answer 1

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

Reason: the foam is an insulator so extra electrons from the negatively charged rod stay localized at the contact point and cannot flow off into the metal can.