Question detail

Which option gives the strongest diagnostic reason? Context: phone speaker coil current-change. Learning objective: (HT only) Recall and apply the equation F = B x I x l for a conductor at right angles to a magnetic field.. Which answer is most accurate for Fleming's left-hand rule (HT only)? Distinct revision anchor: fluxcue417a coilcue417b fieldcue417c polecue417d gridcue417e motorcue417f generatorcue417g transformercue417h compasscue417i currentcue417j voltagecue417k forcecue417l.

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. Fleming's left-hand rule (HT only): phone speaker coil current-change shows (HT only) Recall and apply the equation F = B x I x l for a conductor at right angles to a magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux.
  2. B. It treats a permanent magnet as if it only works when current flows. (prediction error).
  3. C. It confuses the magnetic field with an electric field. (comparison error).
  4. D. It describes energy transfer but misses the force or field interaction. (safety error).

Answer

Fleming's left-hand rule (HT only): phone speaker coil current-change shows (HT only) Recall and apply the equation F = B x I x l for a conductor at right angles to a magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux.

Explanation

Fleming's left-hand rule (HT only): phone speaker coil current-change shows (HT only) Recall and apply the equation F = B x I x l for a conductor at right angles to a magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Fleming's left-hand rule (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The phone speaker coil current-change detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue417a coilcue417b fieldcue417c polecue417d gridcue417e motorcue417f generatorcue417g transformercue417h compasscue417i currentcue417j voltagecue417k forcecue417l: 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 Fleming's left-hand rule (HT only), then explain how it links to a student comparing motor and generator effects and the objective to recall and apply the equation F = B x I x l for a conductor at right angles to a magnetic field.

Related flashcards

Flashcard 1 of 5

Press Space to flip, arrows to move

Related practice questions

Question 1 of 5

Choose an answer, get feedback, then move sideways through the set.

0 of 4 attempted