Question

Which, if any, of the following statements about electric field lines is/are true?

Answer 1

The electric field is always perpendicular to the surface outside of a conductor.
If an electron were placed on an electric field line, it would move in a direction perpendicular to the field.
Electric field lines originate on positive charge and terminate on negative charge.
It is possible for two electric field lines to cross each other.
If an electron and a positron were in the presence of a very strong electric field, they would move away from each other.
It is not possible for the electric field to ever be zero.
If a proton were placed on an electric field line, it would move in a direction anti-parallel to the field.

Answer 2

I said True, False, True, False, False, False, True. Got it wrong- not sure what I did

Answer 3

if a proton were placed in electric field, the proton moves along the electric field ... because electric lines of force are just the path of a force traced by unit +ve charge

Answer 4

"It is not possible for the electric field to ever be zero. "
why is this false? they are not asking for the net electric field right?

Answer 5

The electric field is always perpendicular to the surface outside of a conductor.
TRUE

If an electron were placed on an electric field line, it would move in a direction perpendicular to the field.
FALSE, it would move in an anti-parallel direction because its charge is negative

Electric field lines originate on positive charge and terminate on negative charge.
TRUE ; but they can also go to infinity

It is possible for two electric field lines to cross each other.
Usually FALSE; though technically possible at special points where field is zero.

If an electron and a positron were in the presence of a very strong electric field, they would move away from each other.
TRUE; one is positive, and one is negative. If the field is strong enough, the action of the field will overcome the mutual attraction between them

It is not possible for the electric field to ever be zero.
FALSE: it IS possible, inside a conductor for instance

If a proton were placed on an electric field line, it would move in a direction anti-parallel to the field.
FALSE: being positive, it would move in the SAME direction as the field.