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NEET 2004
Exam
NEET
Year
2004
Subject
Physics
Chapter
Electrostatics

NEET 2004 · Physics · Electrostatics

A electric dipole has the magnitude of its charge as q and its...

A electric dipole has the magnitude of its charge as qq and its dipole moment is pp. It is placed in a uniform electric field EE. If its dipole moment is along the direction of the field, the force on it and it and its potential energy are respectively:

Options

  1. A2 q.E and minimum
  2. Bq⋅Eq \cdot E and p.Ep . E
  3. Czero and minimum
  4. Dq⋅Eq \cdot E and maximum

Correct answer

C. zero and minimum

Step-by-step solution

Force on each charge, of dipole F=F= pEp E ∴\therefore Total force = zero, they are in opposite director ∴P⃗\therefore \vec{P} and E⃗\vec{E} are parallel to each other ∴U=−P⃗⋅E⃗\therefore \quad U=-\vec{P} \cdot \vec{E} is minimum.
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