Electric Fields

Question 1

Definition of Coulomb’s Law

aka electric field strength of TWO points

Answer 1

The electrostatic force between 2 point charges is directly proportional to the product of their charges and inversely proportional to the square of their separation

Question 2

Formula of Coulomb’s Law

Answer 2

Fe = (Q1 Q2)/(4 π ε0 r^2)

Question 3

If electrostatic force is negative

Answer 3

Then it is an attractive force

Question 4

Formula of Electric Field Strength of ONE point

Answer 4

Fe = Q/(4 π ε0 r^2)

Question 5

Definition of Electric Potential at a point

Answer 5

The work done per unit charge in bringing a small test charge from infinity to a point

Question 6

Formula of Electric Potential due to a point charge

Answer 6

EP = Q/(4 π ε0 r)

Question 7

If positive test charge is moving closer to a positive charge

Answer 7

electric potential INCREASES

Question 8

Definition of Electric Field

Answer 8

It is equivalent to the negative gradient of a potential-distance graph at that point

Question 9

Definition of potential gradient of electric field

Answer 9

Rate of change of electric potential with respect to the displacement in the direction of the field

Question 10

Formula of electric field STRENGTH

Answer 10

E = -ΔV/Δr

Question 11

If charge is positive, electric potential…

Answer 11

electric potential decreases