Question

1) Which of the following statements about electric fields and equipotential surfaces are correct? (check all that apply)

a)The electric field direction is always from higher potential to lower potential.

b)The number of electric field lines per unit area perpendicular to the field lines is proportional to the strength of the electric field in that region

c)Equipotential surfaces are surfaces where the potential is constant over this surface.

d)Electric field lines begin on positive charges and end on negative charges.

e)Electric field lines are always tangent to the equipotential surfaces.

2)A 3.0-nC point charge is located at the origin in the xy-plane.

a)What is the magnitude of the electric field at the coordinates (0.26 m, 0.26 m)?

b)If a second point charge of ?3.0 nC is placed at the location where you calculated the electric field in part (a), what will be the magnitude of the force on this second charge due to the field of the first?

Answer 1

part a)

it is a correct statement

part b)

it is correct statemt

no of lines=E.ds

part c)

it is correct

part d)

correct

part e)

correct

Answer 2

i think that

c)Equipotential surfaces are surfaces where the potential is constant over this surface.