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DNA molecules are negatively charged. When places in an electric field, like in an gel during the process of electrophoresis, they all move toward the positive electrode.

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Q: Why all DNA molecules move in the same direction in an electric field?
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How can you experimentally distinguish an electric field from a gravitational field?

Introduce two opposite charged objects one AT A TIME and if they move IN THE SAME DIRECTION, they are in a gravitational field, if they move IN DIFFERENT direction they are in an electric field.


If you place a charge into an electric field it will move in the direction indicated by the electric field lines?

it will occure if the charge is positive, other wise it will move to opposite direction.


A what will move in the direction of the arrows on the electric field lines?

positive charge


Electric field lines point in the opposite direction charges would move if they were in the field?

positive


Why is an electric field considered a vector quanity?

Because if you place a small object with a small electric charge in the field and release it, there's a definite direction in which it will move under the influence of the field. The direction in which a positive test-charge tries to move is defined as the direction of the electric field at that point. Since it has both a magnitude and a direction, it has all the qualifications to be recognized as a vector, and to be granted all the rights and privileges attendant thereto.


What is difference between current and electricfield?

the direction of current is the direction of electrons move. the dirction of electric field can be negative to positive


Electric field lines show the strength and what of an electric field?

Direction and electric flux density. Representing an electric field (and this works with other fields also) with lines is a sophisticated and time honored tradition. The density of lines in any region of space is proportional to the strength (magnitude) of the field in that region of space. The direction of the field is along the direction of the line at each position on each of the lines. In such a graphical representation the field direction goes out from positive charge and in towards negative charge and the visualization usually has some indication of the sign of charge or direction of the field to give the information about direction of the vector field represented by the field lines.


Which direction do molecules naturally move?

they naturally move left because all the molecules need to reach equilibrium


Who discovered electromagnetic force?

Hans Orsted first discovered that when an electric current was run through a wire and put close to a compass, the needle moved toward it. Although, he had no idea what that meant. Michael Faraday, built on his work and found that when an electric current runs through a wire, a magnetic field is produced around the wire. He also found that an electric field is around a wire it produces an electric current. The direction of the current depends on which direction the field is going in. The faster you move the electric field the stronger the current.


A negatively charged object is placed within a positive electric field. what happens to the object?

Electric Field between positive and negative charges. If the Electric Field in which both the positive and negative charges are present is stronger than the Electric Field between the two charges we are talking about, the the negative charge will move away from the positive charge in that positive direction of the field. If not, then the negative charge will get attracted to the positive charge and stay at the position of the positive charge. It will be pulled toward the source of the electric field. (Novanet)


Current is produced when charges are accelerated by an electric field to move to a position of lower what?

Current is produced when charges are accelerated by an electric field to move to a position of lower energy.


Why electric field lines are continuous?

Electric field lines are continuos because they move from +ve to -ve it means they move a particular point from A to B if they move from A to B and then to A then this path way is called discontinuous