Question detail

Which answer avoids the common misconception in this topic? Context: coil-and-galvanometer induction voltage-change. Learning objective: (HT only) State that a coil of wire carrying a current in a magnetic field tends to rotate.. Which answer is most accurate for Electric motors (HT only)? Distinct revision anchor: fluxcue454a coilcue454b fieldcue454c polecue454d gridcue454e motorcue454f generatorcue454g transformercue454h compasscue454i currentcue454j voltagecue454k forcecue454l.

Try the question, check the answer, then read the explanation to understand the curriculum point.

At a glance

MCQ

Type

practice

Style

Topic

The motor effect

Question

  1. A. Electric motors (HT only): coil-and-galvanometer induction voltage-change shows (HT only) State that a coil of wire carrying a current in a magnetic field tends to rotate. because magnetic effects depend on field direction, current or changing magnetic flux.
  2. B. It reverses the role of primary and secondary coils. (pole-test error).
  3. C. It assumes transformers work on direct current without changing flux. (load-effect error).
  4. D. It states the turns ratio changes resistance rather than voltage. (power-link error).

Answer

Electric motors (HT only): coil-and-galvanometer induction voltage-change shows (HT only) State that a coil of wire carrying a current in a magnetic field tends to rotate. because magnetic effects depend on field direction, current or changing magnetic flux.

Explanation

Electric motors (HT only): coil-and-galvanometer induction voltage-change shows (HT only) State that a coil of wire carrying a current in a magnetic field tends to rotate. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Electric motors (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The coil-and-galvanometer induction voltage-change detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue454a coilcue454b fieldcue454c polecue454d gridcue454e motorcue454f generatorcue454g transformercue454h compasscue454i currentcue454j voltagecue454k forcecue454l: in the motor effect, the force is perpendicular to the current and magnetic field; in a generator, relative motion or a changing magnetic field induces a potential difference or induced current; outside a magnet, magnetic field lines go from north to south; AC alternating current changes direction, while DC direct current flows in one direction and needs a commutator in a DC generator context.

Common mistake

motor-effect force direction: avoid motors and generators

Treating motors and generators as interchangeable when answering about motor-effect force direction.

Instead, identify the exact Unit 4.7 idea in Electric motors (HT only), then explain how it links to a loudspeaker coil moving in a magnetic field and the objective to state that a coil of wire carrying a current in a magnetic field tends to rotate.

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