Electric Fields Flashcards

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1
Q

What is stated by coulombs law

A

Magnitude of the force between two point chargers in a vacuum is:
- Directly proportional to the product of their charges
- Inversely proportional to the square of the distance between the charges

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2
Q

Compare the general magnitudes of electric and gravitational forces

A
  • Magnitude of electrostatic forces between subatomic particles is magnitudes greater than magnitude of gravitational forces
  • Because the masses of subatomic particles are smaller relative to the charges of subatomic particles
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3
Q

Definition of electric field strength

A
  • Force per unit charge experienced by an object in an electric field
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4
Q

Equation for electric field strength in uniform field AND in uniform fields formed by parallel plates

A

E = F/Q (uniform)

E = V/d (parallel plates)

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5
Q

How can parallel plates be used to determine the charge of a particle

A
  • Fire a particle at right angles to the field and observe its path
  • Charged particle will experience constant electric force either in or opposite to direction of field
  • Causing particles to accelerate and so it follows a parabolic shape

Positive = Follow direction of field
Negative = Oppose direction of field

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6
Q

Definition of absolute electric potential (V)

A
  • Potential energy per unit charge of a positive point charge at a given point
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7
Q

Describe magnitude of electric potential at surface of charge and at infinity

A

Surface of charge = Maximum

Infinity = zero

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8
Q

How does the sign of the potential depend on sign of charge

A

Positive charge = positive potential (repulsive force)

Negative charge = potential is negative (attractive force) === similar to gravitational potential

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