Magnetism

Question 1

What is the fundamental force that governs the behavior of charged particles?

Answer 1

Electromagnetic force

Question 2

True or False: Electromagnetic forces can act over long distances.

Answer 2

True

Question 3

Fill in the blank: The electromagnetic force is one of the four ________ forces in nature.

Answer 3

fundamental

Question 4

What are the two types of charges in electromagnetism?

Answer 4

Positive and negative

Question 5

Which law describes the force between two charged objects?

Answer 5

Coulomb’s law

Question 6

True or False: Opposite charges attract each other.

Answer 6

True

Question 7

What is the unit of electric charge?

Answer 7

Coulomb

Question 8

What is the relationship between electric field and force experienced by a charge?

Answer 8

The electric field exerts a force on a charge proportional to the magnitude of the charge.

Question 9

What is the formula for the electric field (E) created by a point charge (Q) at a distance (r)?

Answer 9

E = k * |Q| / r^2

Question 10

What does ‘k’ represent in the electric field formula?

Answer 10

Coulomb’s constant

Question 11

True or False: Electric fields can only exist in the presence of charges.

Answer 11

True

Question 12

What is the term for the region around a magnet where magnetic forces can be detected?

Answer 12

Magnetic field

Question 13

What are the two poles of a magnet called?

Answer 13

North and South

Question 14

Fill in the blank: Like poles of a magnet ________, while opposite poles ________.

Answer 14

repel; attract

Question 15

What is the unit of magnetic field strength?

Answer 15

Tesla

Question 16

What is Faraday’s law of electromagnetic induction?

Answer 16

A changing magnetic field induces an electromotive force (EMF) in a conductor.

Question 17

True or False: Electromagnetic waves do not require a medium to travel.

Answer 17

True

Question 18

What speed do electromagnetic waves travel at in a vacuum?

Answer 18

The speed of light (approximately 3 x 10^8 m/s)

Question 19

What is the relationship between frequency and wavelength in electromagnetic waves?

Answer 19

They are inversely proportional.

Question 20

What is the electromagnetic spectrum?

Answer 20

The range of all types of electromagnetic radiation.

Question 21

Fill in the blank: The visible spectrum is a small part of the ________ spectrum.

Answer 21

electromagnetic

Question 22

What is the primary cause of electromagnetic radiation?

Answer 22

The acceleration of charged particles

Question 23

What phenomenon occurs when a charged particle moves through a magnetic field?

Answer 23

It experiences a force perpendicular to both its velocity and the magnetic field.

Question 24

What is the Lorentz force?

Answer 24

The force experienced by a charged particle moving in an electric and magnetic field.

Question 25

True or False: The direction of the Lorentz force can be determined using the right-hand rule.

Answer 25

True

Question 26

What is the principle behind electric motors?

Answer 26

The interaction between electric current and magnetic fields.

Question 27

What is magnetism primarily caused by?

Answer 27

The motion of electric charges.

Question 28

What is a solenoid?

Answer 28

A coil of wire that generates a magnetic field when an electric current passes through it.

Question 29

Fill in the blank: Electromagnetic forces are responsible for holding ________ together in atoms.

Answer 29

electrons

Question 30

What is the unit of electric potential?

Answer 30

Volt

Question 31

What is the formula for calculating electric power?

Answer 31

P = IV (Power = Current x Voltage)

Question 32

What is the term for the opposition to the flow of electric current?

Answer 32

Resistance

Question 33

True or False: Conductors have high resistance.

Answer 33

False

Question 34

What is Ohm's law?

Answer 34

V = IR (Voltage = Current x Resistance)

Question 35

What is the effect of temperature on the resistance of a conductor?

Answer 35

Resistance generally increases with temperature.

Question 36

What is the difference between alternating current (AC) and direct current (DC)?

Answer 36

AC changes direction periodically, while DC flows in one direction.

Question 37

What is a capacitor?

Answer 37

A device that stores electric charge.

Question 38

What is the unit of capacitance?

Answer 38

Farad

Question 39

True or False: Capacitors can release stored energy quickly.

Answer 39

True

Question 40

What is the primary function of an inductor?

Answer 40

To store energy in a magnetic field.

Question 41

What is electromagnetic interference (EMI)?

Answer 41

The disruption of electronic devices caused by electromagnetic radiation.

Question 42

What is the purpose of shielding in electrical cables?

Answer 42

To prevent electromagnetic interference.

Question 43

What is the role of a transformer in an electrical circuit?

Answer 43

To change the voltage level of alternating current.

Question 44

What is the principle of conservation of charge?

Answer 44

Charge can neither be created nor destroyed, only transferred.

Question 45

Fill in the blank: The magnetic field lines emerge from the ________ pole and enter the ________ pole.

Answer 45

North; South

Question 46

What is the relationship between electric field lines and electric force?

Answer 46

Electric field lines point in the direction of the force that a positive charge would experience.

Question 47

What is the significance of the electromagnetic force in daily life?

Answer 47

It underpins the operation of most modern technology, including electronics and communications.