Magnetic Forces and Fleming's Left-Hand Rule Quiz

What happens to a current carrying conductor placed near a magnet?

• It experiences a force.

• It becomes a magnet.

• It loses its current.

• It remains unaffected.

Answer explanation

A current carrying conductor placed near a magnet experiences a force due to the interaction between the magnetic field of the magnet and the current flowing through the conductor.

What causes magnetic forces?

• Electric fields

• Gravitational fields

• Interactions between magnetic fields

• Nuclear forces

Answer explanation

Magnetic forces are caused by interactions between magnetic fields.

Which rule is used to represent the relative directions of the force, the current, and the magnetic field when they are mutually perpendicular?

• Fleming’s right-hand rule

• Fleming’s left-hand rule

• Ampere’s rule

• Faraday’s law

Answer explanation

Fleming’s left-hand rule is used to represent the relative directions of the force, the current, and the magnetic field when they are mutually perpendicular.

What is the unit of magnetic flux density?

• Metre (m)

• Tesla (T)

• Ampere (A)

• Newton (N)

Answer explanation

The unit of magnetic flux density is Tesla (T), which is the correct choice.

Which equation represents the force on a conductor at right angles to a magnetic field carrying a current?

• F = B + I + l

• F = B / I / l

• F = B × I × l

• F = B - I - l

Answer explanation

The correct equation for the force on a conductor at right angles to a magnetic field carrying a current is F = B × I × l.

What is the SI unit of magnetic field strength?

• Weber (Wb)

• Tesla (T)

• Henry (H)

• Gauss (G)

Answer explanation

The SI unit of magnetic field strength is Tesla (T), making it the correct choice among the options provided.

Which law states that the induced electromotive force in any closed circuit is equal to the rate of change of the magnetic flux through the circuit?

• Faraday's Law

• Lenz's Law

• Ohm's Law

• Gauss's Law

Answer explanation

Faraday's Law states that the induced electromotive force in any closed circuit is equal to the rate of change of the magnetic flux through the circuit.

What is the direction of the magnetic field around a current-carrying conductor?

• Parallel to the current

• Perpendicular to the current

• In the direction of the current

• Opposite to the current

Answer explanation

The magnetic field around a current-carrying conductor is perpendicular to the current.

What is the unit of magnetic flux?

• Weber (Wb)

• Tesla (T)

• Henry (H)

• Joule (J)

Answer explanation

The unit of magnetic flux is Weber (Wb), which is a measure of the total magnetic field passing through a surface.

Which device is used to measure the strength of a magnetic field?

• Voltmeter

• Ammeter

• Gaussmeter

• Thermometer

Answer explanation

The device used to measure the strength of a magnetic field is a Gaussmeter, making it the correct choice out of the options provided.