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NEET 2020
Exam
NEET
Year
2020
Subject
Physics
Chapter
Electrostatics

NEET 2020 · Physics · Electrostatics

A short electric dipole has a dipole moment of 16 × 10 ^ – 9 Cm ....

A short electric dipole has a dipole moment of 16×10–9Cm16 \times {10}^{– 9}Cm. The electric potential due to the dipole at a point at a distance of 0.6m0.6m from the centre of the dipole, situated on a line making an angle of 60°60 ° with the dipole axis is:
(14πε0=9×109Nm2C−2)\left(\dfrac{1}{4\pi{ε}_{0}} = 9 \times {10}^{9}N{m}^{2}{C}^{- 2}\right)

Options

  1. A200V200V
  2. B400V400V
  3. Czero
  4. D50V50V

Correct answer

A. 200V200V

Step-by-step solution

We know that,

Electric dipole potential, V=14πε∘pcos(θ)r2V = \dfrac{1}{4\pi{ε}_{∘}}\dfrac{pcos\left(\theta\right)}{{r}^{2}}, for large distance of rr.

V=kPcosθr2=9×109×16×10−9(0.6)2×12V = \dfrac{kPcos\theta}{{r}^{2}} = \dfrac{9 \times {10}^{9} \times 16 \times {10}^{- 9}}{{( 0 .6 )}^{2}} \times \dfrac{1}{2}

V=200VV = 200V

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