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Induction · 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 →

1FoundationMCQTransformers and power transmission1 markPaper 1~2 min

A transformer has a primary coil of 100 turns connected to an AC supply of peak voltage

12\text{ V}

. The secondary coil has 400 turns. What is the peak voltage across the secondary coil?

Solutions

2FoundationMCQFaraday’s law of electromagnetic induction1 markPaper 1~2 min

A rectangular loop of wire has width

0.20\text{ m}

, length

0.50\text{ m}

, and resistance

5.0\ \Omega

. It is pulled out of a region of uniform magnetic field of flux density

0.60\text{ T}

at a constant speed of

2.0\text{ m s}^{-1}

. The plane of the loop is perpendicular to the field. What is the magnitude of the induced current in the loop while it is partially inside the field region?

Solutions

3FoundationMCQLenz's law and applications1 markPaper 1~2 min

A rectangular copper loop of width

0.20\text{ m}

and resistance

0.50\text{ }\Omega

is pulled at a constant velocity of

2.0\text{ m s}^{-1}

out of a region of uniform magnetic field of flux density

0.30\text{ T}

. The plane of the loop is perpendicular to the field. What is the magnitude of the induced current in the loop while it is partially leaving the field?

Solutions

4MasteryMCQTransformers and power transmission1 markPaper 1~2 min

A step-down transformer has 200 turns on the primary coil and 20 turns on the secondary coil. The primary coil is connected to a 240 V AC supply. What is the output voltage across the secondary coil?

Solutions

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