If a dipole is placed in an
external electric field E=20x10ʻN/C, the magnitude of each charge of the dipole is 2C and separated
by distance 10cm, find the work done required to move the dipole from stable to unstable
equilibrium
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Answered by
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Answer:
P=3×10
−8
Cm;E=10
4
N/C
At stable equilibrium (θ
1
)=0
∘
At unstable equilibrium (θ
2
)=180
∘
Work done in a rotating dipole is given by:
W=PE(cosθ
1
−cosθ
2
)=(3×10
−8
)(10
4
)[cos0
∘
−cos180
∘
]=3×10
−4
[1−(−1)]
W=6×10
−4
J.
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