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Exit to H2 Physics 9478

Questions For Electromagnetic Induction (Set 1)

Multiple-choice practice questions on electromagnetic induction with worked explanations.

  • GCE A-Level H2 Physics 2027

Learning objectives

Show all 102 objectives
  • Use SI quantities, units, prefixes and dimensional analysis.
  • Estimate physical quantities and check the reasonableness of results.
  • Assess random, systematic and propagated uncertainties.
  • Resolve, add and subtract coplanar vectors.
  • Explain inertia and momentum, then apply Newton's laws using free-body diagrams.
  • Describe normal, frictional, buoyant and viscous forces qualitatively.
  • Apply Hooke's law within the limit of proportionality.
  • Apply moments, couples and force-and-torque equilibrium using free-body diagrams and vector triangles.
  • show an understanding that the weight of a body may be taken as acting at a single point known as its centre of gravity
  • apply the principle of moments to new situations or to solve related problems
  • Interpret position, displacement, velocity and acceleration using equations and graphs.
  • Derive the uniformly accelerated motion equations from the definitions of velocity and acceleration.
  • Derive and apply uniformly accelerated motion equations with a stated sign convention.
  • Track energy stores and transfers, then apply conservation of energy.
  • Define work and derive and apply the kinetic-energy relationship.
  • Derive Eₖ = ½mv² from the definition of work done by a force and the uniformly accelerated motion equations.
  • Represent fields and relate work done by a field to potential-energy change.
  • Draw field-line representations of uniform and radial gravitational and electric fields.
  • Use force–extension graphs to determine elastic potential energy.
  • Apply power, mechanical power and efficiency relationships.
  • Relate weight and gravitational potential energy changes in a uniform gravitational field.
  • Analyse projectile motion by separating perpendicular components.
  • Explain falling motion with air resistance using forces, energy and terminal velocity.
  • Use impulse and momentum conservation in one-dimensional elastic and inelastic collisions.
  • Express angular displacement in radians and use s = rθ.
  • Relate angular velocity, period, frequency and tangential speed using v = rω.
  • Explain and apply centripetal acceleration and resultant-force relationships.
  • Apply Newton's law of gravitation to point and spherical masses.
  • Derive and apply gravitational field strength, including the near-surface model.
  • Derive the gravitational field strength due to a point mass from Newton's law of gravitation and the definition of field strength.
  • Relate gravitational potential, potential energy and field gradient.
  • Analyse escape speed using conservation of energy.
  • Analyse circular gravitational orbits and geostationary satellite conditions.
  • Use oscillation quantities and describe free oscillations and their investigation.
  • Relate displacement, velocity, acceleration and phase in simple harmonic motion.
  • Identify and analyse simple harmonic motion using its defining equation and sinusoidal solutions.
  • Describe kinetic–potential energy interchange in ideal simple harmonic motion.
  • Compare light, critical and heavy damping and explain critical-damping applications.
  • Distinguish free and forced oscillations, natural frequency and driving frequency.
  • Interpret resonance response curves, damping effects and practical applications.
  • Describe wave models, use wave quantities and interpret wave graphs in space and time.
  • Relate phase difference to separations in time and position.
  • Use wave intensity, amplitude and inverse-square relationships with their assumptions.
  • Explain polarisation and apply Malus’ law to amplitude and intensity.
  • Apply the principle of superposition to resultant displacement.
  • Explain standing-wave formation, nodes, antinodes and energy transfer.
  • Apply boundary conditions to standing waves on stretched strings.
  • Analyse displacement and pressure patterns in resonant air columns and determine sound wavelength.
  • Explain single-aperture diffraction and apply first-minimum and Rayleigh criteria.
  • Explain coherent two-source interference using phase and path difference.
  • Analyse Young double-slit interference and its small-angle assumptions.
  • Use diffraction gratings to analyse principal maxima and determine wavelength.
  • Use thermodynamic temperature and convert between Celsius and kelvin.
  • Use ideal-gas equations with particles, moles and SI units.
  • Apply the kinetic model to gas pressure and mean translational kinetic energy.
  • Derive pV = ⅓Nm⟨c²⟩ from the definition of pressure and a one-dimensional model of molecular collisions extended to three dimensions.
  • Relate microscopic energy, internal energy and thermal equilibrium.
  • Apply work conventions and the zeroth and first laws of thermodynamics.
  • Define and use heat capacity and specific heat capacity in energy balances.
  • Define and use specific latent heat in phase-change energy balances.
  • Apply Coulomb's law to the force between point charges.
  • Define electric field strength and calculate resultant fields due to point charges.
  • Define electric potential and calculate potential due to point charges.
  • Relate electric potential, potential energy and work for systems of point charges.
  • Use the negative potential gradient and relate equipotentials to field lines.
  • Calculate field strength and force in uniform electric fields.
  • Analyse charged-particle motion in uniform electric fields.
  • Apply capacitance and capacitor-energy relationships.
  • Relate current to charge flow, number density and drift velocity.
  • Apply potential difference, e.m.f. and electrical power relationships.
  • Represent sinusoidal a.c. and use peak and r.m.s. values.
  • Analyse mean power in resistive a.c. loads and half-wave rectification.
  • Recall circuit symbols and draw or interpret circuit diagrams.
  • Draw circuit diagrams containing sources, switches, resistors, meters, lamps, thermistors, light-dependent resistors and diodes.
  • Apply resistance and resistivity, interpret I–V characteristics and explain temperature effects.
  • Analyse e.m.f., terminal potential difference and internal resistance in real sources.
  • Analyse series, parallel and potential-divider resistor networks.
  • Combine capacitors in series and parallel.
  • Analyse charging and discharging in RC circuits using the time constant.
  • Calculate and represent magnetic fields produced by currents.
  • Sketch magnetic field lines due to currents in a long straight wire, a flat circular coil and a long solenoid.
  • Analyse forces on current-carrying conductors, current balances and interactions between parallel currents.
  • Analyse forces and paths of moving charges in uniform fields.
  • Apply crossed electric and magnetic fields to velocity selection.
  • Use magnetic flux and flux-linkage relationships.
  • Apply Faraday's and Lenz's laws to induced e.m.f. and direction.
  • Explain simple applications of electromagnetic induction, including motional e.m.f. and eddy currents.
  • Explain simple iron-core transformer operation and apply ideal transformer ratios.
  • Use photon energy and momentum and analyse the photoelectric effect.
  • Apply de Broglie wavelength and wave-particle evidence.
  • Interpret wavefunctions, probability density and superposition.
  • Apply uncertainty and infinite-square-well energy quantisation.
  • Analyse atomic energy levels and emission or absorption spectra.
  • Interpret nuclear structure, isotopes and Rutherford scattering.
  • Analyse random radioactive decay, activity, decay constant and half-life.
  • Relate binding energy per nucleon to fission, fusion, applications and hazards.
  • Apply conservation laws to nuclear equations and beta decay, including antineutrino evidence.
  • Use mass-energy equivalence, mass defect and binding energy.
  • Use techniques and apparatus safely and effectively, and make and record precise observations and measurements
  • Analyse practical data, graphs, gradients and intercepts
  • Evaluate practical limitations and propose specific improvements
  • Plan a practical investigation with controlled variables and a workable method

Use Current Practice First

A horizontal bar is rotating at an angular velocity v about a vertical axis through its centre in a region of constant magnetic field B directed parallel to its vertical axis. What is the e.m.f. between the two ends of the bar?

  1. It is zero.
  2. It is proportional to the product Bv.
  3. It is proportional to the product Bv2.
  4. It is proportional to the product B2v2.

The induced emf on the arms of the rod on each side of the centre of rotation is directed towards the centre. Hence, the emf induced across the whole rod is zero. Answer: 1

A circular coil carries an anticlockwise current as viewed on the page. A straight wire passes perpendicularly through the coil’s centre and carries current out of the page. What is the effect of this set-up on the coil?

  1. It does not experience any force.
  2. The resultant force on the coil is zero.
  3. It experiences an attractive force towards the centre.
  4. It experiences a repulsive force away from the centre.
Click To show/hide answer

At every point on the coil, its current is parallel to the circular magnetic field produced by the central straight wire. Since F = BIL sin θ and θ = 0, each element of the coil experiences zero magnetic force. Answer: 1

A 20-turn square coil of side 8.0 mm is pivoted about an axis through its centre and lying in the plane of the coil. It is placed in a uniform magnetic field of flux density 0.010 T that lies in the coil’s plane and is perpendicular to the pivot axis. A current of 5.0 mA passes through the coil. What is the magnitude of the torque acting on it?

  1. 1.6 x 10-9 N m
  2. 3.2 x 10-8 N m
  3. 6.4 x 10-8 N m
  4. 3.2 x 10-5 N m
Click To show/hide answer

The force on each perpendicular side of one turn is

F = BIL = (0.010)(5.0 × 10⁻³)(8.0 × 10⁻³) = 4.0 × 10⁻⁷ N.

The two forces form a couple with separation 8.0 mm. For 20 turns,

τ = NFd = (20)(4.0 × 10⁻⁷)(8.0 × 10⁻³) = 6.4 × 10⁻⁸ N m.

Answer: 3

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