4 charges are placed each at a distance ‘a’ from origin. The dipole moment of configuration is-

Question

G1 Physics · Accepted Answer

Step 1: Use 𝐩 = Σqᵢ𝐫ᵢ (for net zero charge), V = [1/(4πε₀)](𝐩·𝐞ᵣ/r²) and 𝛕 = 𝐩×𝐄 as needed. Step 2: Resolve 𝐩 into components and use the small-angle approximation τ ≈ -pEθ for oscillations. Step 3: Substitute the given geometry and simplify. Final: A: 2qa𝐣.