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04-BS-9: December 2015

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Electric Field Above a Charged Ring with a Central Point Charge
  2. Question 2 Electric Field Between Two Nested Uniformly-Charged Spheres
  3. Question 3 Minimum Capacitor Plate Radius for a Target Stored Energy
  4. Question 4 Magnetic Field Cancelling an Electric Force on a Moving Electron
  5. Question 5 Magnetic Flux Density at the Centre of a Bent Semicircular Loop
  6. Question 6 Magnetic Fields Around a Three-Conductor Coaxial Transmission Line
  7. Question 7 Induced Voltage Across a Gapped Loop in a Collapsing Field
  8. Question 8 Time Delay Between Skywave and Ground-Wave Arrivals

Start with Question 1 →

National Exams — December 2015 — 04-BS-9 Basic Electromagnetics. Three-hour, closed-book exam (approved Casio/Sharp calculator only). Aids given: $\varepsilon_0=8.85\times10^{-12}$ F/m, $\mu_0=4\pi\times10^{-7}$ H/m, $e=1.6\times10^{-19}$ C. Format: eight questions offered; any five constitute a complete paper and only the first five appearing in the answer book are marked. All eight are solved below for completeness.

Reference texts: Sadiku, Elements of Electromagnetics / Hayt & Buck, Engineering Electromagnetics — Coulomb's law and superposition, Gauss's law, Biot–Savart law, magnetic field of current loops and coaxial conductors, Faraday's law, capacitance and field energy, plane-wave propagation; Young & Freedman, University Physics with Modern Physics — reflection geometry.