Electrostatics Question 318

Question: Two charges +3.2×10−19C and −3.2×10−9C kept 2.4 Å apart forms a dipole. If it is kept in uniform electric field of intensity 4×105volt/m then what will be its electrical energy in equilibrium [MP PMT 2003]

Options:

A) +3×10−23J

B) −3×10−23J

C) −6×10−23J

D) −2×10−23J

Show Answer

Answer:

Correct Answer: B

Solution:

Potential energy of electric dipole U=−pEcos⁡θ

=−(q×2l)Ecos⁡θ

U=−(3.2×10−19×2.4×10−10)4×105cos⁡θ

U=−3×10−23 (approx.)

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