Natural Sciences / Physics

Electromagnetism Quiz

Electricity, magnetism, and fields.

Answer five questions about Electromagnetism and get instant feedback.

Question 1

This image question appears in the interactive quiz.

Answer options

  • Series circuit
  • Parallel circuit
  • Transformer
  • RC circuit

Key Idea

In a series circuit, one break stops current everywhere in the loop.

Question 2

This image question appears in the interactive quiz.

Answer options

  • Reflection
  • Polarization
  • Diffraction
  • Refraction

Key Idea

Reflection preserves angles: incoming and outgoing rays meet the surface symmetrically.

Question 3

What force is given by F=q(E+v×B)\mathbf{F}=q(\mathbf{E}+\mathbf{v}\times\mathbf{B})?

Answer options

  • Lorentz force
  • Coulomb force
  • Gravitational force
  • Spring force

Key Idea

The q v×Bq\,\mathbf{v}\times\mathbf{B} part is always perpendicular to motion, so it can bend a charged particle into circles or helices without changing its speed, while qEq\mathbf{E} can speed it up.

Question 4

For a uniform field, magnetic flux through a flat loop is ...

Answer options

  • ΦB=BAcos⁡θ\Phi_B=BA\cos\theta
  • ΦB=BAcos⁡θ\Phi_B=\frac{B}{A}\cos\theta
  • ΦB=BAsin⁡θ\Phi_B=BA\sin\theta
  • ΦB=BAcos⁡θ\Phi_B=\frac{BA}{\cos\theta}

Key Idea

Because flux is really the field times the loop's projected area, simply rotating the loop changes flux and can induce an emf even if BB is constant (Faraday's law).

Question 5

What field has zero divergence, meaning ∇⋅B=0\nabla\cdot\mathbf{B}=0?

Answer options

  • Magnetic field
  • Gravitational field
  • Velocity field
  • Electric field

Key Idea

Because ∇⋅B=0\nabla\cdot\mathbf{B}=0, magnetic field lines never begin or end, they form closed loops, and introducing magnetic monopoles would modify Maxwell's equation to ∇⋅B=μ0ρm\nabla\cdot\mathbf{B}=\mu_0\rho_m.

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