Podcast
Questions and Answers
What is the primary reason electric forces are much larger than gravitational forces?
What is the primary reason electric forces are much larger than gravitational forces?
- Electric charges are unique to matter.
- Gravitational force is very strong between elementary particles.
- Charges have distinct properties compared to mass. (correct)
- Electric force depends on distance squared.
Which statement about protons and electrons is TRUE?
Which statement about protons and electrons is TRUE?
- Protons are negatively charged.
- Neutrons carry an electric charge.
- They have different magnitudes of charge.
- Electrons and protons exert forces of the same magnitude when separated by the same distance. (correct)
What is the SI unit of charge?
What is the SI unit of charge?
- Volt (V)
- Newton (N)
- Coulomb (C) (correct)
- Ampere (A)
Why are all observable charges multiples of the elementary charge?
Why are all observable charges multiples of the elementary charge?
What is the charge on a proton?
What is the charge on a proton?
Which particles are considered charge carriers in the universe?
Which particles are considered charge carriers in the universe?
Which force determines the interaction between two electrons placed 1 cm apart?
Which force determines the interaction between two electrons placed 1 cm apart?
How does the charge of neutrons compare to that of protons and electrons?
How does the charge of neutrons compare to that of protons and electrons?
Flashcards
Electric Charge
Electric Charge
An intrinsic property of matter, distinct from mass, that causes electric forces between particles.
Elementary Particles
Elementary Particles
The fundamental building blocks of matter, including electrons, protons, and neutrons.
Electron/Proton Mass
Electron/Proton Mass
Electrons and protons have measurable masses. Their masses are significantly different. Protons are heavier.
Electric Force vs Gravitational Force
Electric Force vs Gravitational Force
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Positive and Negative Charge
Positive and Negative Charge
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Coulomb (C)
Coulomb (C)
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Quantized Charge
Quantized Charge
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Elementary Charge (e)
Elementary Charge (e)
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Study Notes
Electric Charge
- Matter is composed of elementary particles
- Electrons, protons and neutrons are common particles
- Electrons and protons have opposite but equal electric forces
- Mass of electron (me) = 9.10940 x 10⁻³¹ kg
- Mass of proton (mp) = 1.67262 x 10⁻²⁷ kg
- Mass of Neutron (mn) = 1.67493 x 10⁻²⁷ kg
Gravitational Force vs Electric Force
- Gravitational force between electron and another electron (1 cm apart) = 5.5 x 10⁻⁶⁷ N
- Electric force between electron and another electron (1 cm apart) = 2.3 x 10⁻²⁴ N
- Electric force is much stronger than gravitational force
Two Kinds of Charges
- Electric force between two electrons is the same as between two protons
- Electric force between proton and electron is attractive
- Charge on an electron repels the charge on another electron
- Charge on an electron attracts the charge on a proton
- Charges can be positive or negative (convention)
Unit of Charge
- Charge is a fundamental property
- Charge can be measured using a standard body
- SI unit of charge is coulomb (C)
- 1 coulomb = charge flowing through a wire in 1 second with a current of 1 ampere (A)
- Charge on a proton (e) = 1.60218 x 10⁻¹⁹ C
- Charge on an electron = -1.60218 x 10⁻¹⁹ C
Charge is Quantized
- Protons and electrons are the main charge carriers
- All observable charges are discrete multiples of the electron charge (e)
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