The magnetic field around a long, straight current-carrying wire is best described as:
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Practise IGCSE 0625 questions in the style of recent Extended past papers, organised by syllabus subtopic. Each set comes with an examiner-style mark scheme and a downloadable worksheet.
These Electromagnetic effects Topical Past Paper Questions are written in the style of recent Cambridge IGCSE Physics 0625 Extended papers and grouped by the Electricity and magnetism (P4.5) section of the 2025–2027 syllabus. Use them to revise the exact skills examiners test in this part of the course.
Each question is graded Easy → Medium → Hard, plus an A★ Challenge for top-grade preparation. Tap a question to mark your own answer, then unlock the examiner-style mark scheme with model solutions and examiner tips. A printable Topical Past Papers worksheet is included so you can practise offline.
Describe the magnetic field around a current-carrying wire and a solenoid. Apply Fleming's left-hand rule for force on a current-carrying conductor in a magnetic field (motor effect). Extended candidates describe electromagnetic induction (Fleming's right-hand rule) and the operation of transformers (Vₚ/Vₛ = Nₚ/Nₛ).
The magnetic field around a long, straight current-carrying wire is best described as:
Inside a current-carrying SOLENOID, the magnetic field is:
A horizontal wire lies between the poles of a horseshoe magnet. The magnetic field points from N (left) to S (right). The conventional current flows AWAY from you (into the page).
State the rule used to predict the direction of the force on the wire.
[1 mark]State the direction of the force on the wire.
[1 mark]A simple d.c. motor consists of a rectangular coil between the poles of a magnet, connected to a battery via a split-ring commutator.
Explain why the coil experiences a TURNING effect when current flows.
[2 marks]State the role of the split-ring commutator.
[1 mark]Fleming's RIGHT-hand rule applies to:
An IDEAL step-down transformer reduces 230 V (a.c.) to 12 V to power a desk lamp. The primary coil has 1150 turns.
Calculate the number of turns on the secondary coil.
[2 marks]The lamp draws a current of 2 A. Calculate the primary current (assume an ideal transformer).
[2 marks]Electricity is transmitted across the National Grid at very high voltages (e.g. 400 kV) rather than at the 230 V used in homes.
Explain why a STEP-UP transformer is used between the power station and the transmission lines.
[2 marks]State what is done to the voltage before it reaches homes, and which device is used.
[1 mark]A power station generates 100 MW. The transmission cables have a total resistance of 5 Ω. If the electricity is transmitted at 400 kV (rather than 25 kV), the power lost in the cables is reduced by approximately a factor of:
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