Grade 8 Physics Quiz: Magnetic Force

What is a magnetic field?

• A region around a magnetic material or a moving electric charge within which the force of magnetism acts.

• The area around a magnet where no force is present

• A type of force that repels all materials

• A type of energy that attracts light

How is the direction of a magnetic field at a point determined?

• By placing a small compass at that point and observing the direction in which the needle of the compass points.

• By asking a friend to guess the direction

• By listening to the sound it makes

• By tasting the air around the point

What are magnetic poles?

• Areas on a magnet where the force is non-existent

• Regions on a magnet where the force is only felt by metal objects

• Regions on a magnet where the magnetic force is the strongest

• Points on a magnet where the force is weakest

What happens when like poles of two magnets are brought near each other?

• They explode

• They attract each other

• They merge into one magnet

• They repel each other

What is the magnetic force on a current-carrying wire?

• Affected by the temperature of the wire

• Determined by the left-hand rule for magnetic force

• Determined by the right-hand rule for magnetic force

• Dependent on the color of the wire

How does the direction of the magnetic force on a current-carrying wire depend on the direction of the current?

• It depends on the length of the wire

• It depends on the color of the wire

• It depends on the material of the wire

• It depends on the direction of the current

What is the name of stored energy due to the interactions of magnetic poles in a magnetic field?

• Magnetic Kinetic Energy

• Magnetic Strength

• Magnetic Potential Energy

• Magnetic Field

How does the magnitude of the magnetic force on a moving charge change with the velocity of the charge?

• Becomes zero

• Remains constant

• Increases

• Decreases

What is the magnetic force on a compass needle?

• The magnetic force on a compass needle is the force exerted by a magnetic field on the needle.

• The magnetic force on a compass needle is caused by gravity

• The magnetic force on a compass needle is the force exerted by a gravitational field on the needle

• The magnetic force on a compass needle is the force exerted by an electric field on the needle

How does the orientation of a compass needle change when placed in a magnetic field?

• It remains stationary

• It spins in the opposite direction

• It aligns with the direction of the magnetic field lines.

• It points towards the South Pole