## Labels

### 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