Flame Behavior in Electric Fields

The video explores electromagnetic induction, starting with Faraday's experiments at the Royal Institution in London. It explains how Faraday discovered that a changing magnetic field can induce an electric current. The video demonstrates the application of this principle in levitating an aluminum plate and lighting bulbs. It also explores the nature of flames, showing how they contain ions and can conduct electricity, which is demonstrated through experiments with electric fields.

What causes the noise heard when the aluminium plate vibrates?

• The plate is vibrating at twice the frequency of the current.

• The coil is malfunctioning.

• The plate is made of a noisy material.

• The plate is hitting the coil.

What was Faraday's key discovery with his electromagnetic induction ring?

• Electricity can be stored in a coil.

• Magnets can be used to power devices.

• A magnetic field can generate electric current.

• Electric current can create a magnetic field.

How did Faraday insulate the wire in his induction ring?

• He used rubber insulation.

• He inserted and insulated the wire as he went.

• He wrapped the wire in cloth.

• He used pre-insulated wire.

What happens to the aluminium plate when a large electric current is passed through the coil?

• It melts.

• It levitates.

• It changes color.

• It breaks apart.

What additional effect does the induced current have on the aluminium plate besides levitation?

• It changes the plate's shape.

• It makes the plate glow.

• It cools the plate.

• It heats the plate.

What is demonstrated by the candle flame experiment?

• Flames can be extinguished by magnets.

• Flames are purely gaseous with no ions.

• Flames contain ions that affect conductivity.

• Flames are not affected by electric fields.

How does the presence of ions in a flame affect its conductivity compared to air?

• It decreases conductivity.

• It makes the flame non-conductive.

• It increases conductivity.

• It has no effect on conductivity.

What happens to the flame when exposed to a strong electric field?

• It becomes brighter.

• It extinguishes.

• It splits into two parts.

• It changes color.

What is one argument against a flame being considered a plasma?

• It is too dense.

• It is too bright.

• It contains no ions.

• It is not hot enough.

What happens to the smoke when the flame is extinguished in an electric field?

• Opposite charges are pulled in opposite directions.

• It is unaffected.

• It becomes more dense.

• It disappears.