KCET 2025 Physics Paper

For a conducting sphere with uniform surface charge distribution:
Inside the sphere (r<R) : The electric field E=0. This is because the electric field within a conductor in electrostatic equilibrium is zero.
Outside the sphere (r≥R) : The electric field behaves like that of a point charge. It can be represented by the equation E=‌

kQ

r2

, where k is Coulomb's constant, Q is the total charge on the sphere, and r is the distance from the center of the sphere.
Thus, the graph depicting the electric field as a function of distance r should show a flat line at E=0 for r<R and then a curve following the inverse square law E=‌

kQ

r2

for r≥R.