Electrodynamics SDU

What is magnetism?

• A force that attracts or repels certain metals.

• A type of gravity

• A type of electricity.

• A chemical reaction.

Who discovered that electricity can create a magnetic field?

• Isaac Newton

• Albert Einstein

• Hans Christian Ørsted

• Michael Faraday

What is the source of a magnetic field?

• Stationary electric charges

• Moving electric charges

• Protons only

• Gravity

What are the two poles of a magnet called?

• Positive and negative

• North and South

• Left and right

• Up and down

If you cut a magnet in half, what happens to the poles?

• Each piece has only one pole

• The magnet stops working

• Each piece still has a North and South pole

• The poles switch places

What shape do magnetic field lines form around a straight current-carrying wire?

• Straight lines

• Squares

• Circles

• Zigzags

What is Ampère’s Law used for?

• To calculate gravity

• To measure magnetic fields around currents

• To describe electric charge

• o explain static electricity

What is a solenoid?

• A single loop of wire

• A coil of wire that creates a magnetic field when current flows

• A type of battery

• A permanent magnet

Increasing the number of loops in a solenoid will make its magnetic field ___.

• Weaker

• Stronger

• Disappear

• The same

Where is the magnetic field strongest in a solenoid?

• Inside the coil

• Outside the coil

• At the ends only

• • There is no strong field