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Electric and Magnetic 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 →

1FoundationMCQApplications in motors and electromagnets1 markPaper 1~2 min

In an electric bell, closing the circuit causes current to flow through an electromagnet, which attracts a soft iron armature and drives a hammer to strike the gong. As the armature moves toward the electromagnet, it breaks the circuit a contact point. Which sequence of events correctly describes what happens immediately after the circuit is broken?

Solutions

2FoundationMCQApplications in motors and electromagnets1 markPaper 1~2 min

A DC motor has a rectangular coil of 100 turns carrying a current of

0.50\text{ A}

. The coil is situated between the poles of a permanent magnet of flux density

B

. The maximum force one side of the coil occurs when that side is perpendicular to the magnetic field. Which change would increase this maximum force one side of the coil?

Solutions

3MasteryMCQElectric fields and potentials1 markPaper 1~2 min

A uniform electric field of

500 \text{ N C}^{-1}

is directed vertically downward. A proton of mass

1.67 \times 10^{-27} \text{ kg}

and charge

+1.60 \times 10^{-19} \text{ C}

is released from rest in this field. Gravitational effects are negligible. Which of the following correctly describes the subsequent motion of the proton?

Solutions

4MasteryMCQElectric fields and potentials1 markPaper 1~2 min

A small metal sphere of radius

r = 2.0 \text{ cm}

is charged to a surface potential of

V = +12 \text{ kV}

. What is the magnitude of the electric field strength at the surface of the sphere?

Solutions

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