Question detail
Which explanation best links the observation to the physics? Context: step-down charger transformer force-link. Learning objective: (HT only) Link opposite forces on the sides of a current-carrying coil to the turning effect in an electric motor.. Which answer is most accurate for Electric motors (HT only)? Distinct revision anchor: fluxcue474a coilcue474b fieldcue474c polecue474d gridcue474e motorcue474f generatorcue474g transformercue474h compasscue474i currentcue474j voltagecue474k forcecue474l.
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
- A. Electric motors (HT only): step-down charger transformer force-link shows (HT only) Link opposite forces on the sides of a current-carrying coil to the turning effect in an electric motor. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (turns-ratio error).
- C. It assumes transformers work on direct current without changing flux. (AC-output error).
- D. It states the turns ratio changes resistance rather than voltage. (coil-core error).
Answer
Electric motors (HT only): step-down charger transformer force-link shows (HT only) Link opposite forces on the sides of a current-carrying coil to the turning effect in an electric motor. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Electric motors (HT only): step-down charger transformer force-link shows (HT only) Link opposite forces on the sides of a current-carrying coil to the turning effect in an electric motor. 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 step-down charger transformer force-link detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue474a coilcue474b fieldcue474c polecue474d gridcue474e motorcue474f generatorcue474g transformercue474h compasscue474i currentcue474j voltagecue474k forcecue474l: 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 moving-coil microphone investigation and the objective to link opposite forces on the sides of a current-carrying coil to the turning effect in an electric motor.
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