An electric dipole of moment \(\vec {p} \) is lying along a uniform electric field \(\vec{E}.\) The work done in rotating the dipole by \(90^{\circ}\) is:
1. \(\sqrt{2}pE\)
2. \(\dfrac{pE}{2}\)
3. \(2pE\)
4. \(pE\)

Subtopic:  Energy of Dipole in an External Field |
 83%
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AIPMT - 2006
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A dipole (\(p\)) is placed so that it is always aligned along the x-axis but it can undergo displacement along the x-axis. The dipole is placed exactly midway between two fixed charges \(-Q\) and \(Q,\) in two possible ways.
                            

Then, the dipole is:
1. stable in both \(A,B\)
2. stable in \(A\), unstable in \(B\)
3. unstable in \(A\), stable in \(B\)
4. unstable in both \(A,B\)
Subtopic:  Energy of Dipole in an External Field |
 57%
From NCERT
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