The correct option is D 2.5×10−3 N/C
Distance of charges from centre of dipole, l=1 mm
Distance of point P from centre of dipole, x=5 m
Magnitude of charge, q=10 nC=10×10−9 C
Angle made of line joining of point P and centre of dipole with axis of dipole, θ=30∘
We know that the magnitude of an electric field at a point P far away (5 m>>1 mm) along the line joining of point P and centre of dipole due to a dipole is given by
Hence, option (d) is correct.