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Potential Energy of a Dipole Notes | Study Physics Class 12 - NEET

Document Description: Potential Energy of a Dipole for NEET 2022 is part of Physics Class 12 preparation. The notes and questions for Potential Energy of a Dipole have been prepared according to the NEET exam syllabus. Information about Potential Energy of a Dipole covers topics like How to Find Potential Energy of a Dipole? and Potential Energy of a Dipole Example, for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Potential Energy of a Dipole.

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How to Find Potential Energy of a Dipole?
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How to Find Potential Energy of a Dipole?

  • Consider a dipole with charges q1 = +q and q2 = -q placed in a uniform electric field as shown in the figure above. The charges are separated by a distance d and the magnitude of the electric field is E. The force experienced by the charges is given as –qE and +qE, as can be seen in the figure.
    Potential Energy of a Dipole Notes | Study Physics Class 12 - NEET

Question for Potential Energy of a Dipole
Try yourself:Choose the best definition of a dipole.
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  • As we know that, when a dipole is placed in a uniform electric field, both the charges as a whole do not experience any force, but it experiences a torque equal to τ which can be given as,
    Potential Energy of a Dipole Notes | Study Physics Class 12 - NEET
  • This torque rotates the dipole unless it is placed parallel or anti-parallel to the field. If we apply an external and opposite torque, it neutralizes the effect of this torque given by τext and it rotates the dipole from the angle Ɵ0 to an angle Ɵ1 at an infinitesimal angular speed without any angular acceleration.
    The amount of work done by the external torque can be given by:

Potential Energy of a Dipole Notes | Study Physics Class 12 - NEET

  • As we know that the work done in bringing a system of charges from infinity to the given configuration is defined as the potential energy of the system, hence the potential energy U(Ɵ)  can be associated to the inclination Ɵ of the dipole using the above relation:
    Potential Energy of a Dipole Notes | Study Physics Class 12 - NEET
  • From the above equation, we can see that the potential energy of a dipole placed in an external field is zero when the angle Ɵ is equal to 90° or when the dipole makes an angle of 90°. Considering the initial angle to be the angle at which the potential energy is zero, the potential energy of the system can be given as:
    Potential Energy of a Dipole Notes | Study Physics Class 12 - NEET
The document Potential Energy of a Dipole Notes | Study Physics Class 12 - NEET is a part of the NEET Course Physics Class 12.
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