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Motion in Electromagnetic Fields · Paper 1 — Free Physics HL Practice Questions

What this topic covers

Fields is where gravity, electricity and magnetism finally get shown to be the same trick played three times: a source (mass, charge, or moving charge), a field that falls off as $1/ r^{2}$ or sits uniform between plates, and a potential that tells you the energy cost of moving through it. HL bolts on two whole subtopics that SL never sees — motion in combined electric and magnetic fields, and electromagnetic induction — and a huge fraction of the marks in this theme come from just two calculation types: transformer turns ratios and induced emf from $ΔΦ/Δ t$ . Get those automatic, then spend the rest of your revision on the sign conventions ( $V_{g}$ is always negative), the vector-vs-scalar traps ( $g$ vs $V_{g}$ , $E$ vs $V$ ), and the direction rules (Lenz's law, $q v \times B$ ) that separate a 6 from a 7.

Read the full Fields lesson notes →

1FoundationMCQMagnetic flux and induction1 markPaper 1~2 min

A bar magnet moves toward a stationary coil connected to a sensitive galvanometer, causing a deflection. Which change, applied individually, would produce a larger deflection than observed?

Solutions

2FoundationMCQMagnetic flux and induction1 markPaper 1~2 min

A coil of 200 turns is placed in a uniform magnetic field. The magnetic flux through each turn changes from

0.030\,\text{Wb}

0.010\,\text{Wb}

0.40\,\text{s}

. What is the magnitude of the average induced emf in the coil?

Solutions

3MasteryMCQCyclotron and magnetic force on a current1 markPaper 1~2 min

A rectangular loop of wire has width

0.10\text{ m}

and length

0.20\text{ m}

and carries a current of

3.0\text{ A}

. The loop is placed in a uniform magnetic field of strength

0.60\text{ T}

with the plane of the loop parallel to the field. What is the magnitude of the torque acting on the loop?

Solutions

4MasteryMCQCyclotron and magnetic force on a current1 markPaper 1~2 min

A straight wire of length

0.20\text{ m}

carries a current of

5.0\text{ A}

. The wire is placed at angle of

30°

to a uniform magnetic field of strength

0.30\text{ T}

. What is the magnitude of the magnetic force acting on the wire?

Solutions

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