OCR A Level Physics A
OCR A Level Physics A Electromagnetism Exam Questions
Free OCR A Level Physics A exam questions on Electromagnetism, with mark schemes. Covers magnetic fields, force on conductors and charges, flux, Faraday's law and transformers.
Electromagnetism exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Physics A H556 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Physics A Electromagnetism
This topic covers electromagnetism.
What you need to know
- Magnetic force F = BIL sin θ and F = BQv.
- Charged particles Circular paths and velocity selectors.
- Induction Flux linkage, Faraday and Lenz.
- Transformers Turns ratio and efficiency.
Common mistakes in Electromagnetism
- Wrong hand rule.
- Forgetting N in flux linkage.
- Saying transformers work on dc.
Try three Electromagnetism exam-style questions
1. A transformer has 100 primary and 500 secondary turns with 12 V in. Find output. (1 mark)
Show the mark scheme answer
60 V.
2. State Faraday's law. (1 mark)
Show the mark scheme answer
Induced emf equals rate of change of flux linkage.
3. Explain why transformers need ac. (1 mark)
Show the mark scheme answer
Only a changing flux induces an emf.
Electromagnetism FAQs
What does Electromagnetism cover?
Magnetic forces, induction and transformers.
Which practical links here?
Investigating magnetic flux density using a Hall probe.
Why use high voltage transmission?
Lower current reduces energy loss.
Revise this topic with flashcards: OCR A Level Physics A H556 Flashcards, with mark scheme answers for Anki and Quizlet.
