An electric dipole of moment 'p' is placed in an electric field of intensity 'E'. The dipole acquires a position such that the axis of the dipole makes an angle \theta with the direction of the field. Assuming that the potential energy of the dipole to be zero when \theta = 90°, the torque and the potential energy of the dipole will respectively be:

  • Option 1)

    p E sin\theta, - p E cos\theta

  • Option 2)

    p E sin\theta, - 2 p E cos\theta

  • Option 3)

    p E sin\theta, - 2 p E cos\theta

  • Option 4)

    p E cos\theta, - p E cos\theta

 

Answers (1)
P Plabita

As we discussed in

Torque, T = ptSin\theta

Potential energy      U=\:-p\:Ecos\theta


Option 1)

p E sin\theta, - p E cos\theta

This option is correct.

Option 2)

p E sin\theta, - 2 p E cos\theta

This option is incorrect.

Option 3)

p E sin\theta, - 2 p E cos\theta

This option is incorrect.

Option 4)

p E cos\theta, - p E cos\theta

This option is incorrect.

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