6.3. Magnetic Fields

• What is a magnetic field defined as?

  A region of magnetic force
• Permanent magnets are objects that produce a persistent magnetic field
• What do magnetic field lines represent?

  Direction and strength
• Magnetic field lines always form closed loops
• Electric currents generate a magnetic field around a current-carrying wire.


  True
• Magnetic field lines point away from the north pole and towards the south pole of a magnet.

  True
• The direction of the magnetic field around a current-carrying wire is determined by the right-hand grip rule
• Match the variable in the magnetic force formula with its unit:

  F ↔️ N (newtons)

  q ↔️ C (coulombs)

  v ↔️ m/s (meters per second)

  B ↔️ T (teslas)
• Permanent magnets, such as iron, nickel, or cobalt, produce a persistent magnetic field
• Magnetic field lines point away from the south pole and towards the north pole of a magnet.

  False
• What rule describes the magnetic field around a current-carrying wire?

  Right-hand grip rule
• The permeability of free space is denoted by $\mu_{0}$.


  True
• If a 2 C charge moves at 5 m/s in a 3 T magnetic field at an angle of 60 degrees, what is the magnetic force on the charge?

  $25.98 \text{ N}$
• A wire 2 m long carrying a current of 4 A in a 1.5 T magnetic field at a 30-degree angle experiences a force of 6 N.
• What is the shape of the magnetic field around a current-carrying wire?

  Circular
• What is the formula for the magnetic force on a moving charge in a magnetic field?

  $F =$$qvBsin\theta$
• What is a magnetic field defined as?

  Region with magnetic force
• What do magnetic field lines depict?

  Direction and strength
• What type of loops do magnetic field lines always form?

  Closed loops
• What is the formula for the magnetic field strength around a current-carrying wire at a distance r?

  $B =$$\frac{\mu_{0} I}{2 \pi r}$
• To determine the direction of the magnetic force on a moving charge, use the right-hand rule.
• The right-hand rule is used to determine the direction of the magnetic force on a current-carrying wire.


  True
• What type of particles do magnetic fields control in particle accelerators?

  Charged particles
• The strength of a magnetic field is measured in tesla
• What does the density of magnetic field lines indicate?

  Strength of the field
• Order the properties of magnetic field lines:

  1️⃣ Direction: North to South

  2️⃣ Density indicates strength

  3️⃣ Form closed loops
• The magnetic field around a current-carrying wire is proportional to the current and inversely proportional to the distance from the wire.


  True
• The magnetic force on a moving charge is zero when the velocity is parallel to the magnetic field.


  True
• What generates a magnetic field around a current-carrying wire?

  Moving electric charges
• The density of magnetic field lines indicates the strength of the magnetic field.
• Match the direction and strength of the magnetic field around a current-carrying wire:

  Direction ↔️ Fingers curl around wire

  Strength ↔️ Inversely proportional to distance
• What is the formula for the magnetic force on a moving charge in a magnetic field?

  F = qvBsin\theta</latex>
• What is the formula for the magnetic force on a current-carrying wire in a magnetic field?

  $F =$$BILsin\theta$
• Match the application of magnetic fields with its description:

  Electric Motors ↔️ Create rotational force

  Generators ↔️ Induce electric current
• Magnetic Resonance Imaging (MRI) uses ionizing radiation to create medical images.

  False