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Electric Charges and Fields Test - 3

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Electric Charges and Fields Test - 3
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  • Question 1
    1 / -0

    A coulomb is same as:

    Solution

    Current = charge/time

    1 amp = 1 coulomb/ 1 sec

    So, one coulomb is ampere times second.

     

  • Question 2
    1 / -0

    Electric flux through a surface does not mean a flow of electric charges through it.

    Solution

    The electric flux does not mean the flow of any physical quantity through a surface. It only signifies the amount of field lines which cross the surface.

     

  • Question 3
    1 / -0

    An electric dipole consists of a positive and negative charge of 4 μC. Each placed at a distance of 5 mm. The dipole moment for the system is

    Solution

    Given: q = 4 μC = 4 × 10-6; d = 5 mm = 5 ×10-3

    The dipole moment = charge x separation distance between them

    p = q × d = 4 × 10-6 × 5 ×10-3

    p = 2 x 10-8 C-m

     

  • Question 4
    1 / -0

    ε0 is:

    Solution

    The permittivity of free space is denoted by the symbol ε0.

     

  • Question 5
    1 / -0

    The direction of force on a negative charge placed at any point in an electric field is given by

    Solution

    The force on a positive charge is in the direction of the electric field so the force on a negative charge is in the opposite direction.

     

  • Question 6
    1 / -0

    SI unit electric field and electric force are

    Solution

    The electric field is force per unit charge, and so its SI unit is N/C. For electric force SI unit is N.

     

  • Question 7
    1 / -0

    If charges that are present in air are placed in water, the force between the two charges

    Solution

    The dielectric constant of water is nearly 80 times that of air, and so the force between the same two charges will be 80 times weaker in water than in air.

     

  • Question 8
    1 / -0

    A charged comb attracts pieces of paper. Why does this happen?

    Solution

    The charged comb polarizes the pieces of paper that induces a net dipole moment in the direction of field.

     

  • Question 9
    1 / -0

    The SI unit of electric charge is

    Solution

    The SI unit of charge is ampere second which is equal to coulomb.

     

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