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JEE Main 2026 · 2 Apr · Shift 2, Physics question 40

Two point charges 8 μC and −2 μC are located at x=2x=2 cm and x=4x=4 cm, respectively on the xx-axis. The ratio of electric flux due to these charges through two spheres of radii 3 cm and 5 cm with their centers at the origin is ________.

Choose one option
Answer and worked solution

Official answer: C

Gauss's law.

  • The 3 cm sphere encloses only the 8 μC charge.
  • The 5 cm sphere encloses both: 8−2=68-2=6 μC.

Ratio. ϕ1:ϕ2=8:6=4:3\phi_1:\phi_2=8:6=4:3.

(C)