Magnetism

Multiple Choice

Which of the following is a fundamental property of magnets?

• They can attract all metals

• They always have a north and south pole

• They lose their magnetism in air

• They are only found in nature

Multiple Choice

Which of the following statements about magnetic poles is correct?

• Like poles attract each other.

• Opposite poles repel each other.

• Like poles repel each other, and opposite poles attract each other.

• There is only one type of magnetic pole.

Fill in the Blanks

The SI unit for measuring the strength of a magnetic field is

.

Multiple Select

Which of the following statements about magnetic field lines are true?

• Magnetic field lines exit from the North pole and enter at the South pole.

• Magnetic field lines always form closed loops.

• The strength of magnetic fields is measured in Teslas (T).

• Magnetic field lines start and end at the same pole.

Multiple Choice

According to the equation F = |q|vBsinθ, what happens to the magnetic force on a moving charge if the angle θ between the velocity and the magnetic field is 0 degrees?

• The force is maximum.

• The force is zero.

• The force is negative.

• The force is doubled.

Multiple Choice

Which of the following statements best describes the use of the right-hand rule in the context of a charged particle moving in a magnetic field?

• It determines the direction of the magnetic field only.

• It determines the directions of force, velocity, and magnetic field vectors.

• It is used to calculate the magnitude of the force on a charged particle.

• It is only applicable to negative charges.

Multiple Select

Which of the following symbols and descriptions are correctly matched for representing vectors in 3D diagrams?

• A circle with a dot: vector into the page (-z)

• A circle with a cross: vector out of the page (+z)

• A circle with a cross: vector into the page (-z)

• A circle with a dot: vector out of the page (+z)

Fill in the Blanks

The formula for the magnetic force on a moving charge is F = |q|vB

θ.

Multiple Select

Which of the following factors affect the magnitude of the magnetic force experienced by a current-carrying wire?

• Magnetic field strength (B)

• Amount of current (I)

• Length of the wire (L)

• Angle between current and magnetic field (θ)

Multiple Choice

Which of the following variables does NOT affect the magnetic torque on a current loop, according to the formula τ = NIBA sinθ?

• Number of turns (N)

• Current (I)

• Magnetic field strength (B)

• Length of wire (l)

Fill in the Blanks

Maximum torque on a current loop occurs when the angle θ is

degrees.

Multiple Choice

What is the formula used to calculate the maximum torque exerted on a rectangular coil placed in a magnetic field?

• τ = NIBA sin θ

• τ = NIB sin θ

• τ = NIA sin θ

• τ = NBA sin θ

Open Ended

What questions do you still have about magnetism after today's lesson?