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An electric dipole of moment p is lying ...

An electric dipole of moment p is lying along a uniform electric field `vec(E)`. The workdone in rotating the dipole by `90^(@)` is

A

`(pE)/(2)`

B

2pE

C

pE

D

`sqrt(2)`pE

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Knowledge Check

  • An electric dipole of dipole moment vecp is placed in a uniform external electric field vecE. Then the

    A
    torque experienced by the dipole is `vecE xx vecp`
    B
    torque is zero if `vecp` is perpendicular to `vecE`
    C
    torque is maximum if `vecp` is perpendicular to `vecE`
    D
    potential energy is maximumn if `vecP` is parallel to `vecE`

  • An electric dipole of moment p is placed in a uniform electric field E. Then (i) the torque on the dipole is p xx E , (ii) the potential energy of the system is p.E, (iii) the resultant force on the dipole is zero

    A
    (i), (ii) and (iii) are correct
    B
    (i) and (iii) are correct and (ii) is wrong
    C
    Only (i) is correct
    D
    (i) and (ii) are correct and (ii) is wrong

  • Electric dipole consists of

    A
    two similar charges, separated by a small distance
    B
    two dis-similar charges separated by a small distance
    C
    two similar charges separated by a large distance
    D
    many charges

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