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# Physics Chapter 1: Electric Charge and Fields

This quiz covers the basics of electrostatics, electric charge, and electric fields. Topics include static charges, forces, fields, and potentials.

Created by
@EvocativeEclipse

### What is the fundamental law of electrostatics?

Like charges repel each other and unlike charges attract each other

Coulomb

Conductor

### What is the basic unit of charge denoted by?

<p>e</p> Signup and view all the answers

### What happens to charges on the surface of a conductor when it is given some charge?

<p>The charges are distributed uniformly on the surface</p> Signup and view all the answers

### What is the process of transferring electrons from one substance to another by rubbing called?

<p>Triboelectrification</p> Signup and view all the answers

### What is the charge Q on a body always given by?

<p>Q=ne</p> Signup and view all the answers

### What type of material behaves as an insulator at low temperature and as a conductor at high temperature?

<p>Semiconductor</p> Signup and view all the answers

### According to Coulomb's law, what is the force between two charges proportional to?

<p>Product of two charges and reciprocal of square of distance</p> Signup and view all the answers

### What happens to charges on the surface of an insulator when it is given some charge?

<p>The charges remain at the same point</p> Signup and view all the answers

### What is the value of the basic unit of charge e?

<p>1.6 x 10-19 C</p> Signup and view all the answers

### What is the type of charge that is associated with a lack of electrons in a matter?

<p>Positive charge</p> Signup and view all the answers

### What is the relationship between the force and distance between two charges?

<p>Force is inversely proportional to square of distance</p> Signup and view all the answers

### What is the constant of proportionality in Coulomb's law?

<p>k</p> Signup and view all the answers

### What is the total charge of an electric dipole?

<p>Zero</p> Signup and view all the answers

### What is the direction of the electric field at a point on the axis of an electric dipole?

<p>Parallel to the axis</p> Signup and view all the answers

### What is the characteristic of electric field lines between two unlike charges?

<p>They are compressed</p> Signup and view all the answers

### What happens when two electric field lines intersect?

<p>It is not possible for two electric field lines to intersect</p> Signup and view all the answers

### What is the midpoint of the location of –q and q in an electric dipole called?

<p>The centre of the dipole</p> Signup and view all the answers

### What is the property of electric field lines that states they do not form a closed loop?

<p>Electric field lines do not form a closed loop</p> Signup and view all the answers

### What is the characteristic of electric field lines between two like charges?

<p>They are expanded</p> Signup and view all the answers

## Study Notes

### Electrostatics

• Deals with the study of forces, fields, and potentials arising from static charges.

### Electric Charge

• A property associated with matter that produces and experiences electric and magnetic effects.
• There are two types of charges:
• Positive charge: Lack of electrons in a matter.
• Negative charge: Excess of electrons in a matter.

### Types of Matter

• Classified into three types based on the flow of charges:
• Conductors: Substances that allow electric charges to flow easily (e.g., iron, aluminum, copper, silver).
• Insulators: Substances that do not allow electric charges to flow (e.g., plastic, wood).
• Semiconductors: Substances that behave as insulators at low temperatures and conductors at high temperatures (e.g., germanium, silicon).

### Charging Methods

• Rubbing method: Friction between two substances can transfer electrons, resulting in charging.

### Electric Field

• A vector quantity that varies from one point to another in space.
• Determined by the positions of the source charges.
• Electric field lines:
• Imaginary and continuous lines that start from positive charges and end at negative charges.
• Represent the direction of electric field at a point.
• Density of electric field lines indicates the magnitude of the electric field.
• For a point charge, electric field lines move radially outward or inward depending on the nature of the charge.

### Electric Dipole

• A pair of equal and opposite charges (+q and -q) separated by a distance 2a.
• The midpoint of the location of -q and q is called the center of the dipole.
• The total charge of an electric dipole is zero.

### Quantisation of Charges

• All free charges are integral multiples of a basic unit of charge (e = 1.6 x 10^-19 C).
• Charge Q on a body is given by Q = ne, where n is an integer number.

### Coulomb's Law

• The force between two charges q1 and q2 is:
• Directly proportional to the product of the two charges (F ∝ q1 x q2).
• Inversely proportional to the square of the distance between the charges (F ∝ 1/r^2).
• The constant of proportionality is Coulomb's constant (k).

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