Electric field lines begin on positive charges and radiate away from them toward negative charges, where they terminate. 3. Equipotential lines are lines connecting points of the same electric potential. All electric field lines cross all equipotential lines perpendicularly.

## Why is the angle between electric field lines and equipotential lines 90?

Now, according to the given question, we know that when the potential becomes constant, the negative potential gradient also becomes zero, which is necessary for the need of the electric field to be always normal with the surface. Thus, the angle between electric lines of force and equipotential surface is 90∘.

## Why are electric field lines perpendicular at a point on a potential surface of a conductor?

Because electric field lines must be perpendicular to the surface of conductor, otherwise there would be a non zero component of electric field along the surface of conductor and charges could not be at rest.

## Why are the equipotential lines near conductor surfaces parallel to the surface and why perpendicular to the insulator surface mapped?

And the reason why equipotential lines are perpendicular to the surface of the insulator is because since there will be electric field lines inside of it, then the equipotential lines will be parallel to those electric fields, and thus perpendicular to the surface because the insulator has a constant curvature at every …

## How do you determine the direction of an electric field from a magnetic field?

To find the direction of propagation of an E&M wave, point the fingers of the right hand in the direction of the electric field, curl them toward the direction of the magnetic field, and your thumb will point in the direction of propagation.

## What is equivalent resistance between A and B?

Hence, the equivalent resistance between A and B is 3Ω.