Year 8 Physics Chapter 8: Turning Forces Quiz

Electric Charge and Field

• Electric charge is a fundamental property of matter, and it can be positive or negative
• Like charges repel each other, while opposite charges attract each other
• The unit of electric charge is the coulomb (C), and it is a scalar quantity

Conductors and Insulators

• Conductors are materials that allow electric charge to flow through them, such as copper wire
• Insulators are materials that do not allow electric charge to flow through them, such as rubber or glass
• The human body is a good conductor of electricity, which is why we can feel electric shocks

Electric Fields

• An electric field is a region around a charged object where the force of the electric charge can be detected
• Electric fields are created by charged objects, and they can be either positive or negative
• The direction of an electric field is defined as the direction of the force experienced by a positive test charge

Electric Field Lines

• Electric field lines are imaginary lines that emerge from positive charges and enter negative charges
• The density of electric field lines represents the strength of the electric field
• Electric field lines can never cross each other, and they can never form closed loops

Electric Field Strength

• Electric field strength is the force per unit charge at a given point in an electric field
• Electric field strength is measured in newtons per coulomb (N/C) and is a vector quantity
• Electric field strength decreases with distance from the charged object