Electromagnetism

Electromagnetism

Multiple Choice

What causes a current to flow.

• a battery

• a cell

• a potential difference.

• resistance

Multiple Choice

What is the atomic number of this atom?

• 1
• 3
• 4
• 7

Multiple Choice

What is the mass number defined as?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

Multiple Choice

What is the atomic number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

Multiple Choice

As electrons move, they make

• A. electromagnetism.
• B. auroras.
• C. ferromagnetism.
• D. magnetic fields.

Multiple Choice

What is a solenoid?

• A coil of wire with current flowing through it

• A type of bar magnet

• A single straight wire

• One loop of a wire

Multiple Choice

What is the shape of a magnetic field around a wire?

Multiple Choice

What is the shape of a magnetic field around a bar magnet?

Multiple Choice

What is the shape of a magnetic field around the Earth?

Multiple Choice

what is the earths magnetic field useful for 

• deflecting the solar wind, charged particles that come from the Sun.
• wind
• sun
• light

Multiple Choice

What does the following represent?
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙

• A crowd with binoculars
• A bunch of coaxial cables 
• Uniform magnetic field directed into the screen away from you
• Uniform magnetic field directed out of your screen at you

Multiple Choice

A magnet must always have two poles, even if cut in half, because

• A magnet is made up of tiny magnetic domains that are aligned.

• Each pole divides in half and the magnetic field becomes weaker.

• Magnetic domains are out of alignment.

Multiple Choice

Permanent magnets have a weaker magnetic field if

• All of its magnetic domains are aligned

• Some of its magnetic domains are not aligned.

• Its magnetic domains are aligned in opposite directions

• It has magnetic electrons in its atoms.