Electromagnetic Forces

Front

What happens when two north poles of a magnet are placed together?

Back

they repel

Front

The area of magnetic force around a magnet is known as its _____________.

Back

magnetic field

Front

The SI unit of magnetic field is: weber, guass, tesla, farad

Back

tesla

Front

An electron is moving north (up) in a region where the magnetic field is south (down). What is the magnetic force exerted on the electron?

Back

zero

Front

The picture is an example of an:

Back

Electromagnet

Front

The microscopic regions in a strongly magnetic material that have all the atoms' magnetic fields line up are called ---.

Back

domains

Front

Where is the magnetic field created by a current running through a straight wire strongest?

Back

Close to the wire

Front

What action will not increase the kinetic energy output of an electric motor connected to a battery? Options: Stronger magnetic field from the permanent magnets, More loops of wire in the spinning coil, Higher voltage for the battery, Lower resistance in the coil, Pulling the spinning coil away from the permanent magnets.

Back

Pulling the spinning coil away from the permanent magnets.

Front

What energy transformation takes place in an electric fan's motor?

Back

electrical energy into kinetic mechanical energy

Front

Making an electromagnet stronger would not involve which of the following?

• More current in the wire
• Making the loops wider
• Packing the loops tighter together
• Having more loops

Back

Making the loops wider