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JEE Main202623 January 2026Evening ShiftPhysicsElectrostaticsActual

Two shorts dipoles (A, B), A having charges 2 C and length 1 cm and B having charges 4 C and length 1 cm are placed with their centres 80 cm apart as shown in the figure. The electric field at a point P , equi-distant from the centres of both dipoles is _ _ _ _ N/C.

Options

  1. A9 16 2 10⁴
  2. B9 2 10⁴
  3. C4.5 2 10⁴
  4. D9 16 2 10⁵

Correct answer

A. 9 16 2 10⁴

Step-by-step solution

E ₂ = - KP₂ r^3 ; E ₁ = - 2KP₁ r^3 P₁ = 2 10⁻⁶ 10⁻² = 2 10⁻⁸ P₂ = 4 10⁻⁶ 10⁻² = 4 10⁻⁸ E _ net = 2 9 10^9 2 10⁻⁸ (0.4)^3 i - 9 10^9 4 10⁻⁸ (0.4)^3 j E _ net = 9 10^9 4 10⁻⁸ (0.4)^3 [ i - j ] | E _ net | = 9 10^4 16 ( 2 )

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