Physical Science: Chapter 19 & 20 Test

What do the lines around this magnet represent?

• Magnetic Field
• North Pole

• South Pole

• Magnetic Domains

Two ways to increase the magnetic force of an electromagnet are:

• 1. Increase the current flow, reduce the number of coils

  2. 
     

• 1. Increase the number of coils and the current flow

• 1. Increase the voltage, decrease the number of coils

• 1. Spread out the coils, replace iron core with rubber.

An iron nail is an example of a:

• magnetic material

• permanent magnet

• electromagnet

• bar magnet

On Earth, where is magnetic north geographically located?

• The Equator

• The North Pole

• The South Pole

• New Brighton

Electric motors are devices that convert _______energy into _______energy

• electrical; mechanical

• chemical; potential

• mechanical; electrical

• mechanical; kinetic

If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate?

• The magnetic field

• The electrostatic field

• The piezoelectric effect

• The chemical reaction of the magnet and the filings

What is the transformation of energy in a generator?

• Mechanical to Electrical

• Electrical to Mechanical

• Potential to Electrical

• Electrical to Thermal

What kind of circuit is this?

• Series

• Parallel

• Consecutive

• Complex

The diagram below represents the magnetic lines of force around a bar magnet. At which point is the magnitude of the magnetic field strength of the bar magnet the weakest

• A

• B

• C

• D

Electric current passing through a wire produces

• permanent magnet

• compass

• magnetic field around wire

• geographic poles