A square of side 20 cm and a spherical surface of radius 80 cm have the same centre. Charges +2 × 10⁻⁶ C, -5 × 10⁻⁶ C, -3 × 10⁻⁶ C and +6 × 10⁻⁶ C are at the four corners of the square. Find the total outward electric flux through the spherical surface in N m² C⁻¹.
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Question

A square of side 20 cm and a spherical surface of radius 80 cm have the same centre. Charges +2 × 10⁻⁶ C, -5 × 10⁻⁶ C, -3 × 10⁻⁶ C and +6 × 10⁻⁶ C are at the four corners of the square. Find the total outward electric flux through the spherical surface in N m² C⁻¹.

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G1 Physics · Accepted Answer

Step 1: Identify the relevant electrostatic principle—Coulomb's law, superposition, Gauss's law, potential-energy conservation or conductor boundary conditions. Step 2: Write the corresponding equation using the quantities in the question and simplify the geometry. Step 3: Substitute the given values and compare with the alternatives. Final: A: Zero.

A square of side 20 cm and a spherical surface of radius 80 cm have the same centre. Charges +2 × 10⁻⁶ C, −5 × 10⁻⁶ C, −3 × 10⁻⁶ C and +6 × 10⁻⁶ C are at the four corners of the square. Find the total outward electric flux through the spherical surface in N m² C⁻¹.