work done by external agent

JEE Mains 2015 Tutorials › Electricity and magnetism questions › work done by external agent

{Shastras Q-21}
a point charge q is brought from infinity and is placed at the center of a conducting neutral spherical shell of inner radius 'a' and outer radius 'b', then work done by external agent is.

A}0
B}kq²/2b
C}kq²/2b - kq²/2a
D}kq²/2a - kq²/2b

#Physics #Electricity and magnetism #Electrostatics

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Akash Anand ·2014-06-17 02:15:41

There will be correction in C option. There won't be any two in denominator for both the terms.

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Sahil Jain ·2014-06-12 02:13:41

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Swastik Haldar no the answer is given as C.
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Rajiv Agarwal ·2014-06-12 23:52:32

When you bring a charge and place it at the centre, then it will induce charges on the spherical shells. From there try and get the answer.

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Sahil Jain -q in the inner surface or inner sheel and +q in the outer surface of outer shell
Upvote·0· Reply ·2014-06-13 03:08:36
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Basic Integral Calculus Operators Symbols Matrix Cases

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∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

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+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω

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work done by external agent

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