22 : Electric fields Flashcards

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1
Q

define electric field strength

A

force experienced per unit positive charge at the point

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2
Q

field produced by positive point charge

A
  • a repulsive field
  • direction of field away from object
  • repels positive charge
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3
Q

field produced by negative point charge

A
  • a attractive field
  • direction of field towards the object
    attracts positive charge
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4
Q

define electric potential

A

work done per unit charge in bringing positive charge from infinity to that point

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5
Q

define electric potential difference

A

work done per unit charge between two points around the particle of charge

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6
Q

effect of distance on electrostatic force

A

the greater the distance the weaker the force

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7
Q

what is coulomb’s law

A

the force between any two point charges is proportional to the product of their charges and inversly proportional to teh square of the distance between them.

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8
Q

permittivity

A

the ability of a material to transmit an electric field

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9
Q

formula for potential at a point in a field

A

V = W/Q

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10
Q

motion of charged particles in a electric field

A
  • projectile motion
  • two components of motion are independent
  • velocity perpendicular is not affected
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11
Q

calculate velocity parallel to plate

A
  • time = length of charged plate / perpendicular speed
  • acceleration = Eq/m
    = v = u+at
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12
Q

formula for electric potential energy near a point charge

A

E = vq

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