Chapter 47 · 549 practice MCQs
MDCAT Electromagnetic Induction MCQs 2026 | Faraday & Transformers
Lenz fights the change, not the field. Unit 11 is Faraday, Lenz, transformers and I²R on the line — and the static magnet in a coil that is silence.
·6 min read·Usman Ubaid
What MDCAT 2026 asks in Unit 47 Electromagnetic Induction
PMDC Unit 11 is induced emf. Faraday: = −N d /dt. More turns, faster change, larger emf. A static magnet sitting in a coil is not zero flux — it is zero change, so zero emf. Lenz: the induced current makes a field that opposes the change. Approach an N pole, the near face becomes N and shoves back.
A transformer is AC in, AC out. Vp/ Step-up at the station, step-down in town, because and I²R loves small I on the long line. Sliding bars and ‘flux from the side’ are the same law in different clothes. DC on a transformer gives a blip, then nothing.
Twenty labs: a magnet you can stab into a coil, a turns-ratio, a line-loss slider.
- = −N d /dt. The minus is a direction (Lenz), not a smaller number.
- Lenz: induced current opposes the change of flux.
- Transformer: Vp/ = Is/Ip (ideal). AC only.
- Step-up raises V, lowers I, cuts I²R on the line.
- A static magnet, or DC after the moment of switching, induces nothing.
Often-asked Electromagnetic Induction MCQ patterns
These are the Electromagnetic Induction ideas that keep coming every year with new numbers.
- A transformer that ‘rectifies’ — that is Unit 13.
- Induced current that helps the change.
- Using DC on a transformer and expecting a secondary voltage after the blip.
- Forgetting the minus is a direction.
- Step-up at the house, step-down at the station — backwards.
Worked Electromagnetic Induction numericals (
Work these on paper first. Then open the Unit 47 quiz — the same numbers are in the questions, with wrong options built from the usual mix-ups.
Flux through a 50-turn coil falls from to 0 in . Average emf?
- The sign (Lenz) says the induced current tries to keep the flux.
. Faster collapse, larger emf. A static would have been .
V AC. Vs?
- This is step-down. Current on the secondary is larger (ideal).
AC. A transformer does not make DC.
Electromagnetic Induction traps that steal the mark
A good option is a true sentence about the wrong quantity. If you miss, the quiz names the mix-up on the option you actually picked.
- A transformer that ‘rectifies’.
- Induced current that helps the change.
- Using DC on a transformer and expecting a secondary voltage after the blip.
- Forgetting the minus is a direction, not a smaller number.
- Saying a static magnet in a coil gives a steady emf because ‘there is flux’.
- Putting the step-up at the house.
Electromagnetic Induction formula sheet for MDCAT 2026
Write these until they are cheaper than thinking. Then open the Electromagnetic Induction quiz and make the picture agree.
- line
How to practise Unit 47 Electromagnetic Induction MCQs
On Faraday, write ‘is changing?’ before you compute. If not, emf is zero regardless of how large is.
On Lenz, name the change (flux in, flux out, N approaching) and then name the opposing face.
Sit EMI after Electromagnetism (flux) and before AC and Electronics (what you do with the induced AC).
Choose topics and a test length up to 180 from the 549-question bank. Tutor Mode explains each selection; Timed Exam reveals explanations on submission. Use the complete review to revise mistakes and download your results.
FAQ
Common questions
Are transformers in the MDCAT electromagnetic induction quiz?
Yes — Faraday and Lenz first, then turns ratio, step-up at the station and I²R on the long line. An ordinary transformer needs changing magnetic flux for continuous induction. A diode rectifier converts alternating input into a unidirectional output; these are different circuit functions.
Why does a static magnet in a coil give zero emf?
Flux is not zero, but d /dt is. Faraday cares about the change. A large constant flux can still give zero induced emf. Changing field strength, loop area or orientation can change flux; use = −N d /dt to identify what actually changes.
Does a transformer convert AC to DC?
No. AC in, AC out. Rectification is Unit 13, diodes, not coils. An ordinary transformer needs changing magnetic flux for continuous induction. A diode rectifier converts alternating input into a unidirectional output; these are different circuit functions.
Why step-up for transmission?
Raise V, lower I for the same power. Line loss I²R then falls with the square of current. For a fixed transmitted power, halving current reduces resistive line loss to one quarter. The voltage is stepped down near consumers for practical use.
What does Lenz’s law actually fight?
The change of flux, not the flux itself. A decreasing downward flux is opposed by a downward induced field. Use the sign of the flux change to find the induced field, then the right-hand rule to find current direction. This opposition is consistent with conservation of energy.
How many Electromagnetic Induction MCQs are available on DIFF. MDCAT?
The current Electromagnetic Induction question bank contains 549 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.
Which topics does the Electromagnetic Induction quiz cover?
The selectable topics are Faraday's Law, Lenz's Law, Transformers. 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.
How do I build a custom Electromagnetic Induction test?
Open the chapter builder, select one or more topics, enter your question count, and choose Tutor Mode or Timed Exam. The available-question total updates with your selection. Start Test generates a shuffled drill; you do not have to follow a fixed Quiz 1 or Quiz 2 sequence.
What is the difference between Tutor Mode and Timed Exam?
Tutor Mode gives feedback and an explanation after you choose an option, and you can change or clear that choice. Timed Exam runs a countdown and keeps explanations hidden until submission. Both modes let you move between questions, use the paper map, and submit for a complete review.
How do I review and download my Electromagnetic Induction quiz?
Select Submit Quiz, then Submit & View Explanations. The review includes every question in your test, all options, your selection, the marked correct answer when a key is available, and the explanation. Download PDF saves a paginated review; Download Review saves an HTML copy you can open in a browser. The review also includes DIFF. MDCAT community links.
How should I use Electromagnetic Induction MCQs to improve?
Start with a short tutor drill on one of these topics: Faraday's Law, Lenz's Law, Transformers. 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.
Ready to sit Unit 47 Electromagnetic Induction — 549 MCQs, 549 labs?