ELECTROSTATICS

Coulomb's law states that electrostatic force is

• directly proportional to the distance between the 2 charges

• directly proportional to the quotient of the 2 charges

• inversely proportional to the distance between the 2 charges

• inversely proportional to the square of the distance between the 2 charges

• Boltzmann's constant

• Coulomb's constant

• spring constant

• wave number

Choose the right relationship of Force against distance between 2 point charges.

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What is the symbol and SI unit for charge?

• C ;

  Coulomb

• Q ;

  Joule

• q ;

  Coulomb

• q ;

  Farad

Choose the right formula for electric field, E =

Which of the following is WRONG about the properties of electric field lines?

• E is small when the field lines are close together and large when they are far apart.

• These electric filed lines never cross each other

• A positive and a negative charge can produce electric field.

• The number of electric field lines entering or leaving a charge is proportional to the magnitude of the charge.

Choose the WRONG description of electric field.

• The electric force, F acting on a  test charge that is placed in the electric field region divided by the magnitude charge of the test charge, q_o.  

• E is a region in which an electric force will act on a charge that is placed in the region.

• Electric field is a scalar quantity.

• Si unit : N C^-1 @ V m^-1

Choose the RIGHT answer related to electric potential.

• V is defined as the work done by external force per unit charge to bring a test charge ( positive charge ) from a point ∞) to infinity

• V is vector quantity

Equipotential line/ surface is a line/surface in which

• all points are at the same Electric field.

• all points are at the different potential.

• all points are at the same electric force.

• all points are at the same potential.

Which of the following is WRONG about the properties of electric potential lines?

• The electric field at every point on an equipotential surface is perpendicular to the surface

• The electric field points in the direction of increasing electric potential.

• The surfaces are closer together where the electric field is stronger.

• No two equipotential surfaces can intersect each other