Physics Quiz Revision Grade 11

What is electromagnetic induction?

• The generation of a magnetic field by a moving electric charge

• The generation of an electric current by a changing magnetic field

• The resistance of a conductor to the flow of current

• The emission of electromagnetic radiation by a heated object

Which of the following factors increases the induced emf in a conductor?

• Decreasing the number of loops in the conductor (N)

• Increasing the number of loops in the conductor coil (N)

• Using a non-magnetic material as the conductor

• Decrease the rate of change in the magnetic flux (∆Φ / ∆t)

What happens when a magnet is moved into a coil of wire?

• No current is induced

• A current is induced in the wire

• The wire heats up but no current is induced

• The magnetic field is destroyed

What is Faraday’s Law of Induction?

• Voltage is directly proportional to current

• A changing magnetic field induces an electric current in a conductor

• Magnetic fields are created by electric charges at rest

• The resistance of a wire increases with temperature

Which of the following factors does not affect the electric potential at a point?

• The amount of charge

• The velocity of the charge

• The distance from the charge

• None of the above

The potential energy of a particle in an electric field divided by its charge is ________________ .

• Electric charge

• Electric potential field

• Conductor

• Kinetic energy

Faraday’s law is given by the equation ____________ .

• 𝑉 =−𝑁∆B /∆t

• 𝑉 =−𝑁∆∅ /∆t

• 𝑉 =𝑁∆∅ /∆t

• V =− ∆∅ / ∆t

Two oppositely charged particles sit next to one another at rest and do not move. Which of the following must be true of the system?

• It has a negative initial potential energy.

• It has a positive initial potential energy.

• There is external work being done.

• It has a positive final potential energy.

Two like charged particles sit next to one another at rest and do not move. Which of the following must be true of the system?

• It has a negative initial potential energy.

• It has a positive initial potential energy.

• There is external work being done.

• It has a positive final potential energy.

How do we use Lenz's Law in electromagnetic induction?

• To determine the direction of both induced current and magnetic field

• To determine the magnitude of the induced current.

• To determine the strength of the Induced magnetic field

• To determine that the induced current decreases the strength of the magnetic field.