Question

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​

Answer 1

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Answer 2

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.