Inv5.Exp2 Total D

In a brushed DC motor, what is the role of the brushes?

• To clean the motor components
• To alternate the current direction through the coil
• To reduce friction
• To generate the magnetic field

The force on a wire in a magnetic field depends on:

• Only the current strength
• Only the magnetic field strength
• Only the wire length
• All of the above

What determines the orientation of the magnetic force on a current-carrying wire?

• The wire's resistance
• The wire's temperature
• The right-hand rule
• The wire's thickness

In an electric motor, what energy transformation occurs?

• Mechanical to electrical
• Electrical to magnetic
• Electrical to kinetic
• Magnetic to electrical

Why is a uniform magnetic field important in these applications?

• It reduces energy consumption
• It ensures consistent force distribution
• It increases the current flow
• It reduces wire resistance

What factor affects the rotational motion of a wire loop in a magnetic field?

• The loop's color
• B. The loop's temperature
• C. The separation of force application points
• D. The loop's weight

How can the torque on a current-carrying loop be analyzed?

• Using temperature measurements
• Using extended free-body diagrams
• Using resistance calculations
• Using current measurements only

What type of power source is used in a brushed DC motor?

• Alternating current only
• Direct current source
• Solar power only
• Wind power only

The magnetic force on a current-carrying wire is:

• Parallel to both current and magnetic field
• Parallel to the current only
• Perpendicular to both current and magnetic field
• Parallel to the magnetic field only

What happens to the force on a wire if the current direction is reversed?

• The force doubles
• The force direction reverses
• The force disappears
• The force remains unchanged