Physics 2nd Sem Interim Review 2

The process of creating a current in a circuit by changing a magnetic field

• A. electric generator
• B. electric motor
• C. electromagnetic induction
• D. magnet

Tags

NGSS.HS-PS2-5

What type of device does the picture show?

• wheel

• galvanometer

• electric motor

The commutator on the device spins continuously because

• the current reverses every half turn

• the voltage of the current increases every turn.

• the current never reverses.

Two parallel copper wires are each carrying the same electrical current in the same direction. Which statement explains how they respond to each other?

• They repel each other, because they have similar magnetic fields.

• They repel each other, because they have opposite magnetic fields.

• They strengthen each other, because they have similar magnetic fields.

• They strengthen each other, because they have opposite magnetic fields.

Which of the following electromagnets would have the greatest magnetic field?

• 
• 
• 
• 

A balloon has a negative charge. A glass rod has a positive charge. What will happen when the glass rod is brought near the balloon?

• The balloon will be attracted to the rod.

• The balloon will be repelled by the rod.

• The balloon will remain in place.

• The balloon will spin in circles.

The figure shown here shows a neutral glass rod and a positively charged metal sphere. Which of the following BEST describes the movement of charges as this glass rod touches the sphere?

• Negative charges move from the sphere to the glass rod.

• Negative charges move from the glass rod to the sphere.

• Positive charges move from the sphere to the glass rod.

• Positive charges move from the glass rod to the sphere.

Precise measuring instruments require shock absorbers to eliminate small vibrations that can affect the results of an experiment. One type of shock absorber that can be used is an electromagnet that repels a magnetic platform placed above it. Which of the following setups would provide the greatest lift to the platform?

• 
• 
• 
• 

An electric circuit is shown here. Why does the compass needle move when the compass is placed near the wire?

• because electric current makes the light bulb give off thermal energy

• because electric current produces magnetic forces

• because the plastic coating on the wires

• because of the light bulb

Find total resistance
total current
and the voltage through resistor 3.

• 60 Ohms, 0.4 A,  8 V
• 60 Ohms, 2.5 A,  4 V
• 90 Ohms, 2.5 A, 24 V
• 60 Ohms, 0.4 A, 24 V