Electrostatic field at a distance r from midpoint of a dipole is proportional to?

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SSC Scientific Assistant Physics Official Paper (Held On: 24 November 2017 Shift 1)
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  1. 1/r2
  2. 1/r
  3. 1/r3
  4. r

Answer (Detailed Solution Below)

Option 3 : 1/r3
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SSC Scientific Assistant Physics Official Paper (Held On: 22 November 2017 Shift 1)
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Detailed Solution

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CONCEPT: 

  • Dipole: The measure of the polarity of the system is the electric dipole moment.
  • The simplest example of an electric dipole is a pair of electric charges of equal magnitude and opposite signs separated by distance.

F1 J.K 3.9.20 Pallavi D6

At any point at r distance from the dipole, Electric field

E=Kpr33cos2θ+1

where p is the dipole moment, r is the distance from the dipole, θ is angle, and K is the constant.

EXPLANATION:

At any point at r distance from the dipole, Electric field

E=Kpr33cos2θ+1

E α 1/r3

So the correct answer is option 3.

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