Question 4 of 11intermediate🔧 ApplyNumerical3 marks
A spherical conductor of radius 12 cm has a charge of –7C distributed uniformly on its surface. What is the electric field
(a)
inside the sphere
Answer
Electric field inside the sphere is zero.
(b)
just outside the sphere
Answer
Electric field just outside the sphere is 10⁵ N/C (or ⁵ N/C).
(c)
at a point 18 cm from the centre of the sphere?
Answer
Electric field at 18 cm from the centre is ⁴ N/C.
Explanation
This question tests understanding of electrostatic field distribution for a charged spherical conductor. The context clearly states that 'Just inside the surface, the electrostatic field is zero' and provides the formula E = σ/ε₀ for the field at the surface. For points outside, the field follows inverse square law.