Magnetism

What did Hans Christian Ørsted observe when he turned on an electric current near a compass?

• The compass needle remained stationary.

• The compass needle started to move.

• The electric wire became magnetized.

• The current in the wire stopped flowing.

What happens if a bar magnet is cut in half?

• You get one north magnet and one south magnet.

• The magnetic properties are destroyed.

• You get two smaller magnets, each with a north and south pole.

• The magnet becomes an electromagnet.

What unit is used to measure the strength of a magnetic field?

• Ampere

• Volt

• Tesla

• Newton

According to the First Right-Hand Rule, if your thumb points in the direction of the electric current, what do your curled fingers indicate?

• The direction of the electric field.

• The direction of the magnetic field lines.

• The strength of the electric current.

• The force exerted on the wire.

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

• The current, the length of the wire, the magnetic field strength, and the angle between the current and the magnetic field.

• The resistance of the wire, the voltage, and the temperature.

• The mass of the wire, its density, and its specific heat capacity.

• The material of the wire, its cross-sectional area, and its elasticity.

Under what condition will a current-carrying wire experience the minimum magnetic force when placed in a magnetic field?

• When the current is perpendicular to the magnetic field lines.

• When the current is parallel to the magnetic field lines.

• When the magnetic field strength is at its maximum.

• When the length of the wire is maximized.

What is the correct formula for calculating the magnitude of the force on a single charged particle moving through a magnetic field?

• F = ILBsinθ

• F = qvBsinθ

• F = ma

• F = kQq/r^2

When using the right-hand rule to determine the direction of the magnetic force on a charged particle, if the particle is negatively charged, what does the direction of your thumb indicate?

• The direction of the magnetic field.

• The direction of the particle's velocity.

• The direction of the force.

• The direction opposite to the force.