Electromagnetic Forces

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

• they repel
• they attract
• they cancel each other out
• the strength of the magnet is doubled

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

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

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The SI unit of magnetic field is 

• weber
• guass
• tesla
• farad

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

• zero

• north (up)

• towards you (out of the screen)

• east (right)

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The picture is an example of an:

• Electric generator

• Electromagnet

• Electric nail

• Electric power cell

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

• electrolytes

• nodes

• orbitals

• domains

• poles

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If a current is running through a straight wire, where is the magnetic field created by that current strongest?

• Close to the wire

• Far from the wire

• Where the wire is connected to the battery

• Everywhere has the same magnetic field

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An electric motor is connected to a battery. Which of the following will not make the motor output more kinetic energy?

• 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

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

• electrical energy into kinetic mechanical energy

• kinetic mechanical energy into electrical energy

• alternating current to direct current

• electrical energy to electric power

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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

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