Four identical point charges of are fixed at the corners of a square of side
PHYSICS · Subjective · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields
Problem
Four identical point charges of +5.0μC are fixed at the corners of a square of side 0.40m. The region x>0 (the right half of the square) is filled with a dielectric liquid of relative permittivity κ=2.0, while the region x<0 remains vacuum. A +2.0μC test charge is placed at the geometric center of the square. Assuming the interaction between the test charge and any corner charge is governed by the permittivity of the region in which that corner charge lies, calculate the magnitude of the net electrostatic force on the test charge.