PHY113-2 (Magnetic Forces and Magnetic Fields)

The needle of a compass is temporary magnet that has a north magnetic pole (N) at one end and a south magnetic pole (S) at the other.

• True

• False

Answer explanation

The needle of a compass is permanent magnet that has a north magnetic pole (N) at one end and a south magnetic pole (S) at the other.

The behavior of magnetic poles is similar to that of like and unlike electric charges.

• True

• False

It is surrounding the magnet

• thermal field
• electric field
• magnetic field
• gravitational field

The direction of the magnetic field at any point in space is the direction indicated by the north pole of a small compass needle placed at that point.

• True

• False

Which of the statements are true

• The magnetic field lines and pattern of iron filings in the vicinity of a bar magnet

• The magnetic field lines in the gap of a horseshoe magnet

• The magnetic field lines and pattern of iron filings in the vicinity of a horseshoe magnet

• The magnetic field lines in the gap of a bar magnet

• When a charge is placed in an electric field, it experiences a force

• When a charge is placed in an electric field, it repels force

• When a charge is removed in an electric field, it experiences a force

• When a charge is placed in an electric field, it attracts force

The following conditions must be met for a charge to experience a magnetic force when placed in a magnetic field:

• The velocity of the charge must have a component that is perpendicular to the direction of the magnetic field.

• The charge must be moving.

• The charge must be constant.

• The velocity of the charge must have a component that is opposite to the direction of the magnetic field.

Magnitude of the magnetic field at any point in space

• where the angle (0<0<180°) is the angle between the velocity of the charge and the direction of the magnetic field.

• where the angle (0<0<180°) is the angle between the velocity of the charge and the opposite direction of the magnetic field.

SI Unit of Magnetic field

• Charged particle in an electric field.

• Charged particle in a magnetic field.