Static Electricity

Question 1

Charge

Answer 1

If an object is negatively charged it has gained electrons

If an object is positively charged it has lost electrons

Question 2

Unit of Electric Charge

Answer 2

The unit of electric charge is the coulomb (C)

Question 3

Insulator

Answer 3

Any substance through which electric charge cannot flow is called an insulator

Question 4

Conductor

Answer 4

Any substance through which electric charge can flow is called a conductor

Question 5

Where do Static Charges Reside?

Answer 5

All static charges reside on the outside of a conductor

Static charge on a conductor tends to accumulate where the conductor is most pointed

Question 6

Coulomb’s Law

Answer 6

States that the force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them

Question 7

Electric Field

Answer 7

An electric field is any region of space where a static electric charge experiences a force other than the force of gravity. An electric field is always caused by other static charges in the vicinity

Question 8

Line of Force (Electric Field Line)

Answer 8

An electric field line is a line drawn in an electric field showing the direction of the force on a positive charge placed in the field

Question 9

Electric Field Strength

Answer 9

The electric field strength E at a point in an electric field is the force per unit charge at that point, i.e. electric field strength is the force per coulomb

Question 10

Unit of Electric Field Strength

Answer 10

The unit of electric field strength is the newton per coulomb ( N / C ). This is the same as the volt per metre ( V / m )