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Assignment 3- The Electric Field

# Assignment 3- The Electric Field - Electric Fields and...

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Electric Fields and Forces Learning Goal: To understand Coulomb's law, electric fields, and the connection between the electric field and the electric force. Coulomb's law gives the electrostatic force acting between two charges. The magnitude of the force between two charges and depends on the product of the charges and the square of the distance between the charges: , where . The direction of the force is along the line connecting the two charges. If the charges have the same sign, the force will be repulsive. If the charges have opposite signs, the force will be attractive. In other words, opposite charges attract and like charges repel. Because the charges are not in contact with each other, there must be an intermediate mechanism to cause the force. This mechanism is the electric field. The electric field at any location is equal to the force per unit charge experienced by a charge placed at that location. In other words, if a charge experiences a force , the electric field at that point is . The electric field vector has the same direction as the force vector on a positive charge and the opposite direction to that of the force vector on a negative charge. An electric field can be created by a single charge or a distribution of charges. The electric field a distance from a point charge has magnitude

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Picture 380 Picture 381 Picture 382 Picture 383 Electric Fields and Forces . The electric field points away from positive charges and toward negative charges. A distribution of charges creates an electric field that can be found by taking the vector sum of the fields created by individual point charges. Note that if a charge is placed in an electric field created by , will not significantly affect the electric field if it is small compared to . Imagine an isolated positive point charge with a charge (many times larger than the charge on a single electron). Part A There is a single electron at a distance from the point charge. On which of the following quantities does the force on the electron depend? Check all that apply. ANSWER: the distance between the positive charge and the electron the charge on the electron the mass of the electron the charge of the positive charge
Picture 384 Picture 385 Picture 386 Picture 387 Picture 388 Picture 389 Electric Fields and Forces Part A the mass of the positive charge the radius of the positive charge the radius of the electron Correct According to Coulomb's law, the force between two particles depends on the charge on each of them and the distance between them. Part B For the same situation as in Part A, on which of the following quantities does the electric field at the electron's position depend? Check all that apply. ANSWER:

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Picture 390 Picture 391 Picture 392 Picture 393 Picture 394 Electric Fields and Forces Part A Correct The electrostatic force cannot exist unless two charges are present. The electric field, on the other hand, can be created by only one charge. The value of the electric field depends only on the charge producing the electric field and the distance from that charge.
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