MDCAT Electromagnetism MCQs 2026 | Lorentz Force, r = mv/qB

No. F ⊥ v, so the speed is constant. Only the direction changes. The magnetic part of the Lorentz force has zero dot product with velocity and therefore does no work. An electric field can change kinetic energy, so distinguish a purely magnetic field from a combined electric and magnetic field.

The B that exerts $1\mathrm{N}$ on a $1\mathrm{C}$ charge moving at $1m/s$ perpendicular to the field. Use $F=|q|vB$ sin $\theta$; perpendicular motion gives $\sin \theta =1.$ The tesla can also be written N/(A·m), and the force reverses for a negative charge.

No. $T=2\pi m/qB.$ Faster particles take a bigger circle in the same time. For non-relativistic motion perpendicular to a uniform magnetic field, the period is independent of speed and orbit radius. Use the magnitude of charge; the sign determines the direction of rotation.

When $B=0$, or $A=0$, or the loop is edge-on ($\theta =90^{\circ },\cos \theta =0).$ The angle in $\Phi$ = BA cos $\theta$ is measured from the surface normal, not from the plane of the loop. A loop edge-on to the field has its normal perpendicular to the field.

The current Electromagnetism question bank contains 702 practice MCQs across 3 topics. This is the bank size, not the length of one test. Choose your topics and a question count from 1 to 180, limited by the questions available in those topics.

The selectable topics are Magnetic Field, Magnetic Flux, Charged Particles. Use Select all for a broad chapter drill, Clear to start a focused selection, or choose individual topics. Questions are drawn from your chosen topics, so you can target a weak concept before returning to a wider test.

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Start with a short tutor drill on one of these topics: Magnetic Field, Magnetic Flux, Charged Particles. Read the explanation for incorrect and uncertain answers, revise the relevant textbook section, and retry before taking a timed drill. Compare your reasoning with the answer key rather than memorising the option letter.