D.3 Motion in electromagnetic fields

Question 1

Electric Field Strength (E)

Answer 1

The force per unit charge experienced by a small positive test charge placed in the field

Question 2

Equation for Electric Force (F)

Answer 2

F = qE, where q is the charge and E is the electric field strength.

Question 3

Uniform Electric Field

Answer 3

A field in which the electric field strength is constant in magnitude and direction.

Question 4

Direction of Electric Force on a Positive Charge

Answer 4

In the direction of the electric field lines.

Question 5

Direction of Electric Force on a Negative Charge

Answer 5

Opposite to the direction of the electric field lines.

Question 6

Magnetic Field Strength (B)

Answer 6

A vector quantity that represents the magnitude and direction of a magnetic field.

Question 7

Lorentz Force

Answer 7

The force exerted on a charged particle moving through a magnetic field, perpendicular to both the velocity of the particle and the magnetic field

Question 8

Right-Hand Rule for Magnetic Force

Answer 8

Thumb points in the direction of velocity, fingers in the direction of magnetic field, and palm points towards the force on a positive charge.

Question 9

Circular Motion of Charged Particle

Answer 9

Occurs when a charged particle moves perpendicular to a uniform magnetic field, resulting in a centripetal force.

Question 10

Radius of Circular Motion (r)

Answer 10

Determined by r = mv/(qB), where m is mass, v is velocity, q is charge, and B is magnetic field strength.

Question 11

Equation for Magnetic Force (F)

Answer 11

F = qvB sin(θ), where q is charge, v is velocity, B is magnetic field strength, and θ is the angle between velocity and magnetic field.

Question 12

Maximum Force on a Charged Particle

Answer 12

Occurs when θ = 90°, making sin(θ) = 1.

Question 13

Zero Magnetic Force

Answer 13

Occurs when θ = 0° or 180°, as the charged particle moves parallel or antiparallel to the magnetic field.

Question 14

Factor Affecting Magnetic Force

Answer 14

Velocity of the charged particle, magnitude of charge, magnetic field strength, and the angle of motion relative to the magnetic field.

Question 15

What is the measurement unit for magnetic field strength?

Answer 15

Tesla (T)

Question 16

Direction of Magnetic Field Around a Current-Carrying Conductor

Answer 16

Determined by the right-hand grip rule: thumb points in the direction of conventional current, and fingers curl in the direction of the magnetic field.

Question 17

Calculating the Force on a Wire in a Magnetic Field

Answer 17

F = ILB sin(θ), where “I” represents the current through the wire, “L” is the length of the wire within the magnetic field, “B” indicates the magnetic field strength, and “θ” is the angle between the direction of the current and the magnetic field.

Question 18

Behavior of Magnetic Force in Parallel Current-Carrying Wires

Answer 18

The magnetic force is attractive when currents flow in the same direction and repulsive when they flow in opposite directions.

Question 19

Application of Magnetic Force on Current-Carrying Conductors

Answer 19

Used in devices like electric motors and measuring instruments.

Question 20

Permeability of Free Space (μ₀)

Answer 20

A constant that describes the extent to which a magnetic field can penetrate space.