MCQ PHYSICS:

Q1 an electric dipole of moment p is lying along a uniform electric field E. The work done in rotating the dipole by `90^{0}` is E is 

  • pE
  • 3pE
  • 2pE
  • `\frac{E}{p}`

pE 


Q2 The electric field intensity due to electric dipole at a point of distance r from its centre varies as: varies as 

  • r
  • `r^{2}`
  • `r^{-2}`
  • `r^{-3}`

  • `r^{-3}`Electric field intensity due to an electric dipole varies inversely as cube of the distance of the point.
  •  


    Q3 S.I. unit of electric dipole moment is 

    • Am
    • `Am^{-1}`
    • Cm
    • `Cm^{-1}`

    Cm  


    dipole moment = charge × length of dipole = Coulomb × meter = C m

    Q4 a stationary charge produces: 

    • an electric field only
    • an magnetic field only
    • both electric and magnetic field
    • None of these

    an electric field only 


    A stationary charge produces an electric field only whereas moving charge produces both electric as well as magnetic field.

    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

    Zero 


    Q6 force experienced by a dipole in uniform electric field is called  

    • linear force
    • Nuclear force
    • torque
    • all of these

    Torque 


    A dipole placed in uniform electric field experiences pair of equal and opposite forces having different lines of action form a couple and produces a torque

    Q7 What is the angle between the electric dipole moment and the electric field strength due to it on the axial line 

    • Zero
    • `90^{0}`
    • `180^{0}`
    • `60^{0}``

  • Zero. The direction of electric field on axial line is same as that of dipole moment i.e. from negative to positive charge
  •  


    Q8 The electric field outside a spherical shell and solid sphere is 

    • Same
    • different
    • both a and b are possible
    • None

    Same 


    Q9 The electric field inside a solid sphere is 

    • Directly Proportional to `r^{2}`
    • Inversely Proportional to `r^{2}`
    • Inversely Proportional to r
    • Directly Proportional to r

    Directly Proportional to r 


    Q10 The electric field lines provide information about? 

    • Field strength
    • direction of electric field
    • nature of charge
    • all of these

    all of these 


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