Electric Fields 2.1

Question 1

What is electric charge?

Answer 1

Property that causes electrostatic forces when objects are placed in electric field

Question 2

What is electrostatic force?

Answer 2

a force experienced due to electric charge causing a change in motion

Question 3

How is electrostatic force consistent with Newton’s Third Law?

Answer 3

when 2 charged objects interact, they exert equal and opposite force on each other.

Question 4

Electrostatic Force & Newton’s Third Law

Give an example on when Electrostatic Force is consistent with Newton’s 3rd Law.

Answer 4

When a proton exerts an attraction force on the electron, the electron will exert an equal attraction force opposite in the direction of the proton.

Question 5

Why can something be charged?

Answer 5

Uneven number of electrons and protons
ions
simply just a proton/electron

Question 6

What is Coulomb’s Law used for?

Answer 6

To calculate the electrostatic force between 2 stationary point charges that act along a straight line

Question 7

Coloumb’s Law

What happens to Electrostatic Force if one charge of an object doubles?

Answer 7

They also double since the charge and the force are directly proportional to each other

Question 8

Coloumb’s Law

What happens to Electrostatic Force if the radius between the objects triples?

Answer 8

Then the Force will decrease to 1/9 of its original value since they are inversely proportional

Question 9

Why is electrostatic force stronger than gravitational force?

Answer 9

The Coulomb’s constant is stronger than the gravitational constant in their formulas

Question 10

What is an electric field?

Answer 10

A region in space where a point (stationary) charge experiences an electrostatic force from another point charge due to the electric field created

Question 11

What does the electric line force show the direction of?

Answer 11

Where a proton (positive) charge would move to

Question 12

What does the number of these electric field lines mean?

Answer 12

The magnitude/strength of the electric field

Question 13

What’s an electric dipole?

Answer 13

When 2 point charges are separated by only a small distance and affected by the electric field generated by the other

Question 14

Draw the electric field lines if the 2 point charges are the same?

Question 15

Draw the electric field lines if the 2 point charges are NOT the same?

Question 16

Draw & describe the electric field lines for a hollow conductor

Answer 16

Surface is positively charged by there is no electric field inside

Question 17

Draw & describe the electric field lines for a pear-shaped conductor

Answer 17

electric field strength is > because of high charge density from the curvature of the sharp points

Question 18

What’s Corona Discharge?

Answer 18

When electric field strength is so strong it ionises air molecules into cations and electrons

Those can accelerate due to the electric field and go ionise even more air
which moves the overall charge away from conductor.

Question 19

How does the electric field near sharp points ionise air?

Answer 19

sharp points produce strong electric field
polar molecules in air attracted to the sharp point
Electron transfer (ionisation) occurs and they become charged
The charged things interacts with other nearby polar air molecules
Causes a charge movement away from sharp points

Question 20

Derive the formula for Electric Field strength using Coloumb’s Law?

Answer 20

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