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Physics > Electromagnetism > Flashcards

Electromagnetism Flashcards

1
Q

What is the basic principle behind electromagnetism?

A

Electromagnetism is the interaction between electric charges and magnetic fields.

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2
Q

True or False: Electric fields can exist independently of magnetic fields.

A

True

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3
Q

What is the unit of electric charge?

A

Coulomb (C)

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4
Q

Fill in the blank: The force between two charged objects is described by __________ Law.

A

Coulomb’s

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5
Q

What is the formula for calculating the electric force between two charges?

A

F = k * (|q1 * q2| / r^2)

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6
Q

What does the variable ‘k’ represent in Coulomb’s Law?

A

Coulomb’s constant

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7
Q

Define electric field.

A

An electric field is a region around a charged particle where a force would be exerted on other charges.

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8
Q

What is the unit of electric field strength?

A

Volts per meter (V/m)

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9
Q

True or False: Magnetic fields are produced by moving electric charges.

A

True

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10
Q

What is the unit of magnetic field strength?

A

Tesla (T)

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11
Q

What is the right-hand rule used for in electromagnetism?

A

To determine the direction of the magnetic field around a current-carrying conductor.

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12
Q

Fill in the blank: A __________ is a material that can be magnetized.

A

magnet

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13
Q

What does Ohm’s Law state?

A

V = I * R, where V is voltage, I is current, and R is resistance.

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14
Q

True or False: Resistance is directly proportional to the length of a conductor.

A

True

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15
Q

What is a capacitor used for?

A

To store electrical energy in an electric field.

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16
Q

What is the unit of capacitance?

A

Farad (F)

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17
Q

Define inductance.

A

Inductance is the property of a conductor that opposes a change in current.

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18
Q

What is the unit of inductance?

A

Henry (H)

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19
Q

What is Faraday’s Law of Electromagnetic Induction?

A

The induced electromotive force in a circuit is proportional to the rate of change of magnetic flux through the circuit.

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20
Q

What is Lenz’s Law?

A

Lenz’s Law states that the direction of induced current is such that it opposes the change in magnetic flux.

21
Q

Fill in the blank: The magnetic field lines around a magnet always form __________ loops.

A

closed

22
Q

What is the difference between AC and DC current?

A

AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction.

23
Q

What is the formula for calculating power in an electrical circuit?

A

P = V * I

24
Q

True or False: Superconductors have zero electrical resistance.

A

True

25
Q

What is an electromagnet?

A

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

26
Q

What happens to the magnetic field of an electromagnet when the current is turned off?

A

The magnetic field disappears.

27
Q

Fill in the blank: The __________ effect describes the production of voltage across a conductor when it is exposed to a changing magnetic field.

A

induction

28
Q

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

A

To increase or decrease voltage levels in AC circuits.

29
Q

What is the principle of operation of a transformer?

A

Electromagnetic induction.

30
Q

Define magnetic flux.

A

Magnetic flux is the measure of the quantity of magnetism, taking into account the strength and the extent of a magnetic field.

31
Q

What is the unit of magnetic flux?

A

Weber (Wb)

32
Q

What is the relationship between current, voltage, and resistance in a circuit?

A

Ohm’s Law: V = I * R.

33
Q

True or False: Electromagnetic waves require a medium to travel through.

A

False

34
Q

What is the speed of light in a vacuum?

A

Approximately 3 x 10^8 meters per second.

35
Q

What is the electromagnetic spectrum?

A

The range of all types of electromagnetic radiation, from radio waves to gamma rays.

36
Q

Fill in the blank: The __________ is the region of space around a charged particle where it exerts a force on other charged particles.

A

electric field

37
Q

What is the term for the opposition that a circuit offers to the flow of electric current?

A

Resistance

38
Q

What device is used to measure electric current?

A

Ammeter

39
Q

What is a magnetic pole?

A

Either of two regions at opposite ends of a magnet where the magnetic force is strongest.

40
Q

True or False: Like poles of magnets repel each other.

A

True

41
Q

Fill in the blank: The __________ is a material that allows electric current to flow easily.

A

conductor

42
Q

What is the principle behind electric generators?

A

Converting mechanical energy into electrical energy through electromagnetic induction.

43
Q

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

A

To protect the circuit by breaking the connection when the current exceeds a certain level.

44
Q

What type of wave are electromagnetic waves?

A

Transverse waves

45
Q

Fill in the blank: The frequency of a wave is the number of __________ that pass a point in one second.

A

cycles

46
Q

What does the term ‘ground’ refer to in electrical circuits?

A

A common return path for electric current.

47
Q

What is the purpose of shielding in electrical systems?

A

To protect sensitive components from electromagnetic interference.

48
Q

True or False: Electromagnetic fields can have both electric and magnetic components.

A

True

49
Q

What is a solenoid?

A

A coil of wire that produces a magnetic field when carrying an electric current.

Physics (12 decks)

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