Question

This is a kind of electroscope student made in science class to study charges. Student Procedure: -Tear off two pieces of tape, each 4 inches (10 cm) long. -Press each piece firmly on the work table leaving one end of each tape piece sticking up as a handle. -Quickly pull the tapes from the table and stick one piece on the arm of a straw in one film canister, and the other piece on the arm of a straw in the other film canister. --Move the canisters so the two pieces of tape are face to face, about 6 inches apart. -Slowly move the canisters closer together. This experiment illustrates several important facts about forces that include ALL BUT ONE of those listed here.

A) Like charges repel or exert push.
B) Pushing forces can work at a distance
C) Like charges exert a pull from a distance.
D) Friction force can cause a transfer of charge.

Answer 1

Option C) 'Like charges exert a pull from a distance.' is incorrect because like charges repel each other, as observed in the student's electroscope experiment with tape, which behaves similarly to a traditional electroscope with gold foil leaves.

Step-by-step explanation:

The student's homemade electroscope illustrates several key concepts about electric charges and forces. However, option C) “Like charges exert a pull from a distance.” is incorrect. Like charges repel each other. An electroscope can be used to detect electric charges—when a charged object is brought near or in contact with the electroscope, the like charges repel each other, causing movement in the device (such as the separation of gold leaves). This experiment with the tape is similar, demonstrating the repulsive force between like charges. Friction from peeling the tape off the table transfers electrons, charging the tape. When two similarly charged pieces of tape are brought close together, they repel due to the electrostatic force. This is consistent with the properties observed in an electroscope, where like charges repel due to electrostatic forces.