Home
Class 12
PHYSICS
An electric dipole with dipole moment 4 ...

An electric dipole with dipole moment `4 xx 10^(-9)` Cm is aligned at 30° with the direction of a uniform electric field of magnitude `5 xx 10^4 NC^(-1)`. Calculate the magnitude of the torque acting on the dipole.

Text Solution

Verified by Experts

Torque exerted on given dipole,
`vec(tau) = vecp xx vecE`
`therefore tau = pEsin theta`
`=(4 xx 10^(-9)) (5 xx 10^(4))sin 30^(@)`
`tau = 10^(-4) Nm` (In the direction of `vecp xx vecE`)
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ELECTRIC CHARGES AND FIELDS

    KUMAR PRAKASHAN|Exercise SECTION B NUMERICALS (ADDITONAL EXERCISE)|10 Videos

  • ELECTRIC CHARGES AND FIELDS

    KUMAR PRAKASHAN|Exercise SECTION B NUMERICALS (NUMERICAL FOR .DARPAN. BASED ON TEXTBOOK)|8 Videos

  • ELECTRIC CHARGES AND FIELDS

    KUMAR PRAKASHAN|Exercise SECTION B NUMERICALS (NUMERICAL FROM TEXTUAL ILLUSTRATIONS)|24 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    KUMAR PRAKASHAN|Exercise Section-D (MCQs asked in GUJCET/Board Exam)|1 Videos

  • ELECTROMAGNETIC INDUCTION

    KUMAR PRAKASHAN|Exercise Section D MCQs (MCQs asked in Competitive Exams )|38 Videos

Similar Questions

Explore conceptually related problems

An electric dipole with dipole moment 4xx10^(-9) c m is aligned at 30^(@) calculate the magnitude of the torque acting on the dipole

A square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30^@ with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitude of torque experienced by the coil?

Knowledge Check

  • An electron falls freely in electric field of 9.1 xx 10^3 NC^(-1) , then acceleration of electron is .......

    A
    `1.6 xx 10^(13) ms^(-2)`
    B
    `1.6 xx 10^(15) cm//s^(2)`
    C
    `1.6 xx 10^(15) ms^(-2)`
    D
    `1.6 xx 10^(11) ms^(-2)`

    • Similar Questions

    Explore conceptually related problems

    A square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30^(@) with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitude of torque experienced by the coil ?

    What is the force acting on electric dipole in uniform electric field ?

    Write an equation of torque on dipole placed in uniform electric field.

    The work in rotating electric dipole of dipole moment p in an electric field E through an angle theta from the direction of electric field, is:

    A molecule of a substance has a permanent electric dipole moment of magnitude 10^(-29) C m. A mole of this substance is polarised (at low temperature) by applying a strong electrostatic field of magnitude 10^(6) V m^(-1) . The direction of the field is suddenly changed by an angle of 60^(@) . Estimate the heat released by the substance in aligning its dipoles along the new direction of the field. For simplicity, assume 100% polarisation of the sample.

    A molecule of a substance has a permanent electric dipole moment of magnitude 10^(-30) Cm. A mole of this substance is polarised (at low temperature) by applying a strong electrostatic field of magnitude 10^(7) vm^(-1) . The direction of the field is suddenly changed by an angle of 60^(@) . Estimate the heat released by the substance in aligning its dipole along the new direction of the field. For simplicity assume 100 % polarisation of the sample. 1 mole = 6 xx 10^(23) molecule.

    A bar magnet of magnetic moment 1.5 JT^(-1) lies aligned with the direction of a uniform magnetic field of 0.22 T. (a) What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment: (i) normal to the field direction (ii) opposite to the field direction? (b) What is the torque on the magnet in cases (i) and (ii)?

    Home
    Profile