Question 1
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Key Idea
In a series circuit, one break stops current everywhere in the loop.
Electromagnetism Quiz
Electricity, magnetism, and fields.
Answer five questions about Electromagnetism and get instant feedback.
Question 2
This image question appears in the interactive quiz.
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Key Idea
Reflection preserves angles: incoming and outgoing rays meet the surface symmetrically.
Question 3
What force is given by $\mathbf{F}=q(\mathbf{E}+\mathbf{v}\times\mathbf{B})$?
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Key Idea
The $q\,\mathbf{v}\times\mathbf{B}$ part is always perpendicular to motion, so it can bend a charged particle into circles or helices without changing its speed, while $q\mathbf{E}$ can speed it up.
Question 4
For a uniform field, magnetic flux through a flat loop is ...
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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 $B$ is constant (Faraday's law).
Question 5
What field has zero divergence, meaning $\nabla\cdot\mathbf{B}=0$?
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Key Idea
Because $\nabla\cdot\mathbf{B}=0$, magnetic field lines never begin or end, they form closed loops, and introducing magnetic monopoles would modify Maxwell's equation to $\nabla\cdot\mathbf{B}=\mu_0\rho_m$.
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