MCQ ON FRICTIONAL ELECTRICTY: QUIZ ON FRICTIONAL ELECTRICTY

 


PART 2

Q1 Electric field at the center of charged circular loop is

  • ∞ 
  • Always  0  
  • None of these



Q2 Direction of electric field on the axis of a charged ring is along

  • ⊥ to the axis 
  • along the axis 
  • `45^{0}` with axis 
  •  the centre


  •  

    Q3 .The net force acting on a dipole in a uniform electric field is

    • In the direction of electric field
    • Opposite to the direction of electric field
    • Always zero
    • In a direction ⊥ to electric field



    Q4 The potential energy of a dipole is  zero if angle made by the dipole moment with electric field is

    • `45^{0}` 
    • `90^{0}` 
    • `180^{0}` 
    • `0^{0}` 

    •  


    Q5 The dipole is said to be in stable equilibrium when the dipole moment is

    • In the direction of the field
    • Opposite to the direction of the field
    • ⊥ to the direction of the field
    • At `45^{0}` with the direction of the field


    Q6 The dipole is said to be in unstable equilibrium when the dipole moment is

    • In the direction of the field
    • Opposite to the direction of the field
    • ⊥ to the direction of the field
    • At`45^{0}` with the direction of the field


     

    Q7 If a dipole is placed in a non uniform electric field then it will experience ?

  • Torque as well as force
  • Only torque but no force
  • Only force but no torque
  • Zero force and zero torque

    Q8 Torque has the units of

    • Nm
    • Cm
    •  `Nm^{2}`
    • `Cm^{-1}`



    Q9 A system of two equal and opposite charges separated by a certain distance is called

    • Electric field 
    • Electric dipole
    • Electric dipole moment
    • Electric flux



    Q10 Dipole length is a ...

    • Scalar quantity 
    • Vector quantity






    PART 4

    Q1 Force acting on a stationary point charge q in an electric field E is 

    • `q^{2}E`
    • `\frac{q}{E}`
    • qE
    • `\frac{E}{q}`



    Q2 Electric field intensity due to a source charge at a distance r varies as 

    • r
    • `r^{2}`
    • `r^{-2}`
    • `r^{-1}`


  •  


    Q3 Dimensional formula of electric field is 

    • `MLT^{-3}A^{-1}`
    • `MLT^{-2}A^{-1}`
    • `ML^{2}T^{-2}A^{-1}`
    • `MLT^{2}A^{-1}`

     


    Q4 The electric field E at a point just outside a perfect conductor is 

    • parallel to surface
    • zero
    • perpendicular to surface
    • any direction

     


    Q5 The electric field inside a spherical shell of uniform surface charge density 

    • Zero
    • constant less than zero
    • directly proportional to distance from center
    • None of these



    Q6 which of the following is deflected by a electric field 

    • neutrons
    • alpha particles
    • gamma rays
    • all of these


    Q7 An electron and a proton are in a uniform electric field. The ratio of their accelerations will be 

    • Zero
    • unity
    • `\frac{m_p}{m_e}`
    • `\frac{m_e}{m_p}`


  •  


    Q8 an electron enters in the electric field with its velocity in direction of electric field then 

    • path of electrons will be circle
    • path of electrons will be parabola
    • velocity of electrons will decrease
    • velocity of electrons will increase



    Q9 an electron having charge e and mass m moving in a uniform electric field E. Its acceleration will be 

    • `\frac{e^2}{m}`
    • `\frac{E^2}{m}e`
    • `\frac{eE}{m}`
    • `\frac{mE}{e}`



     

    ELECTRIC FLUX


    Q1 Units of Electric flux are

    • `NC^{-1}m^{2}`
    • `NC^{-2}m^{-1}`
    • `N^{-1}C^{-1}m^{2}`
    • `NC^{2}m^{2}`



    Q2 Electric Flux through a closed surface according to Gauss’ law is

    • `\frac{ε_{0}}{q}`
    • `\frac{q}{ε_{0}}`
    • `q{ε_{0}}`
    • None of these

  • `
  •  

    Q3 Electric Flux is minimum when the angle between the electric field lines and the area vector of the surface is

    • `0^{0}`
    • `90^{0}`
    • `60^{0}`
    • `45^{0}`

    •  


    Q4 The electric field due to infinite plane sheet of charge density σ is:

    • 0
    • σ
    • `\frac{σ}{ε_{0}}`
    • `\frac{σ}{2ε_{0}}`



    Q5 The electric flux due to a line charge falls off with distance as

    • `\frac{1}{r}`
    • `\frac{1}{r^{2}}`
    • r
    • None of these



    Q6 Units of Electric flux are

    • `NC^{-1}m^{2}`
    • `NC^{-2}m^{-1}`
    • `N^{-1}C^{-1}m^{2}`
    • `NC^{2}m^{2}`



    Q7  Electric field inside charged spherical shell is zero

    • True
    • False


  •  

    Q8 Area Vector is a 

    • Scalar quantity
    • Vector quantity




    Q9 Electric flux is a scalar quantity

    • True
    • False


    Q10 The area vector of a surface lying in the x-y plane on the coordinate axes, points along the z direction

    • True
    • False

     


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