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?
Which statement about protons and electrons is TRUE?
Which statement about protons and electrons is TRUE?
What is the SI unit of charge?
What is the SI unit of charge?
Why are all observable charges multiples of the elementary charge?
Why are all observable charges multiples of the elementary charge?
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What is the charge on a proton?
What is the charge on a proton?
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Which particles are considered charge carriers in the universe?
Which particles are considered charge carriers in the universe?
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Which force determines the interaction between two electrons placed 1 cm apart?
Which force determines the interaction between two electrons placed 1 cm apart?
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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?
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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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Description
Test your understanding of electric charge and the fundamental forces that govern interactions between particles. This quiz covers elementary particles, gravitational vs electric forces, types of charges, and the units of charge. Ideal for students studying physics at an introductory level.
