MCQ PHYSICS: MCQ ON ELECTRIC DIPOLE

 

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