Chapter 9 Electromagnetic Induction

Choose the best definition for magnetic field.

• A force that attracts all objects towards the Earth.
• A region where only electric charges can be observed.
• A region around a magnetic material or moving electric charge where magnetic forces can be observed.
• A type of energy that is emitted by all materials.

Choose the best definition for magnetic flux.

• The total magnetic field passing through a given area.
• The amount of electric current flowing through a conductor.
• The direction of magnetic field lines.
• The strength of a magnetic field at a point.

Which of the following is the formula to calculate magnetic flux?

• Φ = B · A · cos(θ)
• Φ = B - A · sin(θ)
• Φ = B / A
• Φ = B + A + θ

What is the unit for magnetic flux?

• Volt (V)
• Henry (H)
• Tesla (T)
• Weber (Wb)

Calculate the magnetic flux if the magnetic field strength is 2 T and the area is 4 m² .

• 6 Wb
• 10 Wb
• 4 Wb
• 8 Wb

What happen to magnetic flux if area of plane in the magnetic field decreases?

• Magnetic flux remains constant.
• Magnetic flux becomes zero.
• Magnetic flux increases.
• Magnetic flux decreases.

What happen to the magnetic flux if the magnetic field intensity increases?

• The magnetic flux decreases.
• The magnetic flux increases.
• The magnetic flux remains constant.
• The magnetic flux becomes zero.

Which of the following equation represents Faraday's Law?

• EMF = -dΦ/dt
• EMF = dΦ/dt
• EMF = k * dΦ/dt
• EMF = -Φ/t

What is Faraday's Law?

• Faraday's Law states that electric currents can exist without magnetic fields.
• Faraday's Law explains how to create magnetic fields using only heat.
• Faraday's Law describes the relationship between changing magnetic fields and electric currents.
• Faraday's Law is a principle that only applies to static electricity.

What is Lenz's Law?

• Lenz's Law describes how induced currents oppose changes in magnetic flux.
• Lenz's Law states that induced currents enhance changes in magnetic flux.
• Lenz's Law is a principle that describes the attraction between magnets.
• Lenz's Law explains how magnetic fields can be created without any current.