Write the expression for the work done on an electric dipole of dipole moment \overrightarrow{p} in turning it from its position of stable equilibrium to a position of unstable equilibrium in a uniform electric field { {\E}}^{\to}.

CBSE Class 12 Physics 2013 Paper

Question : 1

Total: 29

Write the expression for the work done on an electric dipole of dipole moment

→

in turning it from its position of stable equilibrium to a position of unstable equilibrium in a uniform electric field

→

Solution:

In stable equilibrium the angle between

→

and

→

is 0∘
In unstable equilibrium the angle between

→

and

→

is 180∘
‌ So, ‌‌‌ ‌ the work done ‌‌=PE(cos‌θ1−cos‌θ2)
=PE(cos‌0∘−cos‌180∘)
‌=PE(1+1)
‌=2PE

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