Figure shows two concentric spherical shells having radii 1 m and 2 m respectively. Outer spherical surface has charge − 3.2 × 1 0 − 15 Coulomb. If inner surface is now earthed by closing the switch t

Question

Figure shows two concentric spherical shells having radii 1 m and 2 m respectively. Outer spherical surface has charge $- 3.2 \times 1 0^{- 15}$ Coulomb. If inner surface is now earthed by closing the switch then $(x \times 1 0^{+ y})$ are number of electrons that move towards earth. Find $(x + y) . (x, y \in I, 0 \leq x, y \leq 9)$ .

diagram

TestHub · Accepted Answer

Inner shell earthed: 1 k Q ​ + 2 k ( − 3.2 × 1 0 − 15 ) ​ = 0 ⇒ Q = 1.6 × 1 0 − 15 C . Electrons moving to earth = 1.6 × 1 0 − 19 1.6 × 1 0 − 15 ​ = 1 × 1 0 4 , so x + y = 1 + 4 = 5 .

Physics - Electrostatics Question with Solution | TestHub

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