Question

Which variable does not increase the strength of an electromagne

options:

Increasing the distance between the coils
Increasing the distance between the coils

Increasing the number of coils
Increasing the number of coils

Increasing the thickness of the wire
Increasing the thickness of the wire

Adding batteries to the electromagnet

Answer 1

There are different methods to electrically charge an object. A girl slides down a plastic slide and her hair sticks up as she exits the bottom of the slide. This is an example of which method of building up an electric charge?

options:

Induction
Induction

Neutralization
Neutralization

Conduction
Conduction

Friction

Answer 2

The variable that does not increase the strength of an electromagnet is:

**Increasing the distance between the coils.**

Increasing the distance between the coils would actually decrease the strength of the magnetic field produced by the electromagnet, as the magnetic field strength diminishes with distance. The other options—adding more coils, increasing the thickness of the wire, and adding more batteries—can all contribute to a stronger electromagnet.

Answer 3

The situation described, where a girl slides down a plastic slide and her hair sticks up as she exits, is an example of **Friction**.

As she slides down the plastic, electrons are transferred from the slide to her hair (or vice versa), resulting in a buildup of static electricity due to the friction between the two materials. This causes her hair to stand up as it becomes positively charged and repels each other.