Magnetic Fields and Electromagnetism Quiz

A wire is mounted vertically, the direction of the magnetic field is counterclockwise when viewed from above. Using the right – hand rule what is the direction of the electric current?

• From right to left
• From left to right
• Upward
• Downward

Where does magnetism of a permanent magnet come from?

• The temperature of the surrounding environment.
• The presence of electric fields around the magnet.
• The movement of electrons in aligned atoms that reinforces the magnetic field electromagnet in a conductor.

• The alignment of magnetic domains in ferromagnetic materials.

Which of these describes how a magnet picks up paper clips?

• Paper clips are attracted to magnets because they are made of plastic.
• A magnet repels paper clips due to its magnetic field.
• A magnet picks up paper clips by creating a vacuum around them.
• The ferromagnetic material in the paper clips realigns under the influence of the magnets magnetic field so that each paper clip become a new magnet.

Which of these can be used to induce a current in a closed circuit without the use of a battery or an electrical power supply?

• Connecting a light bulb directly to a resistor.
• Using a solar panel to generate electricity.
• Applying heat to the circuit components.
• Magnetic Field

What is electromagnetic induction?

• Electromagnetic induction refers to the attraction between two magnets.
• Electromagnetic induction is the process of creating a magnetic field using electric current.
• Electromagnetic induction is the conversion of light energy into electrical energy.
• Electromagnetic induction is the formation of a voltage across a conductor in a changing magnetic filed.

Hydroelectric power plants produce electricity. Which form of input energy does the plant transform to generate electricity?

• Chemical energy from batteries
• Kinetic energy of wind
• Kinetic energy

• Thermal energy from coal

Which alignment is expected of lines of the magnetic field around a current carrying wire?

• Straight lines parallel to the wire.
• Random patterns with no specific shape.
• Spirals moving away from the wire.
• Concentric circles around the wire.

Which of these describes the process of magnetic resonance imaging (MRI)?

• MRI is a method for measuring blood pressure in the brain.
• MRI is a hydrogen atoms align with the magnetic field and emit radio waves once the field is shut off.

• MRI uses only X-rays to create images of the body.
• MRI is a medical imaging technique that uses magnetic fields and radio waves to create detailed images of the body's internal structures.

Many technologies use changing magnetic fields. What happens if a changing magnetic field is placed near a wire?

• The wire emits light.
• The wire heats up instantly.
• The formation of an electric field generates an electrical current in the wire.

• The wire becomes magnetized.

A long piece of copper wire is coiled into the shape of a spring. Which events occur when a long bar magnet is moved back and forth repeatedly within the coil even though the magnet does not touch the coil?

• The moving magnet generates a magnetic filed that causes an electric current in the wire.

• The wire heats up and melts.
• The magnet loses its magnetic properties.
• The coil becomes magnetized permanently.