Module 6: Electromagnetism
8 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.
Inquiry Question 1: What happens to stationary and moving charged particles when they interact with an electric field?
- Investigate and quantitatively derive and analyse the interaction between charged particles and uniform electric fields, including: electric field between parallel charged plates E = V/d, acceleration of charged particles by the electric field F_net = ma, F = qE, work done on the charge W = qV, W = qEd, K = (1/2)mv^2
A focused answer to the HSC Physics Module 6 dot point on charged particles in uniform electric fields. The parallel-plate formula E = V/d, the force F = qE, work-energy theorem W = qV, and a worked electron-gun example with traps to avoid.
8 min answer → - Model qualitatively and quantitatively the electric field, including direction and shape, produced between parallel charged plates and the potential difference, using E = V/d
A focused answer to the HSC Physics Module 6 dot point on the parallel plate electric field. Field shape, the meaning of uniform field, the relationship E = V/d, why E is independent of position between the plates, and the fringing effect at the edges.
7 min answer →
Inquiry Question 2: How does the motion of a charged particle in a magnetic field differ from its motion in an electric field?
- Analyse the interaction between charged particles and uniform magnetic fields, including: acceleration, perpendicular to velocity F = qv x B, circular motion of a charged particle moving perpendicular to a uniform magnetic field
A focused answer to the HSC Physics Module 6 dot point on charges moving in magnetic fields. The Lorentz force qv x B, why it does no work, circular motion with radius r = mv/(qB), period T = 2 pi m / (qB), and the right-hand rule for direction.
9 min answer → - Investigate quantitatively and analyse the interaction between current-carrying conductors and uniform magnetic fields F/l = I B sin theta, including parallel current-carrying wires F/l = mu_0 I_1 I_2 / (2 pi r)
A focused answer to the HSC Physics Module 6 dot point on the magnetic force on a current-carrying conductor. The single-wire result F = BIL sin theta, the parallel-wire result F/l = mu_0 I_1 I_2 / (2 pi r), the definition of the ampere, and direction by the right-hand rule.
8 min answer →
Inquiry Question 4: How are electric and magnetic fields applied in electrical generation, transmission and use?
- Analyse the operation of DC and AC motors, including the torque on a current loop tau = n B I A cos theta, the role of the commutator, back EMF, and the AC induction motor principle
A focused answer to the HSC Physics Module 6 dot point on motors. Torque on a current loop tau = nBIA cos theta, the split-ring commutator in DC motors, back EMF and its role in steady-state current, the rotating-field principle of the AC induction motor, and where each is used.
10 min answer → - Analyse the operation of ideal and real transformers, including the turns ratios V_s/V_p = N_s/N_p and I_p/I_s = N_s/N_p, energy losses, and the role of step-up and step-down transformers in AC power transmission
A focused answer to the HSC Physics Module 6 dot point on transformers. Ideal voltage and current ratios, power conservation V_p I_p = V_s I_s, the four energy losses in real transformers, and why high-voltage AC transmission minimises line losses.
9 min answer →
Inquiry Question 3: Under what circumstances is an electrical voltage generated by a magnetic field?
- Describe and quantitatively analyse electromagnetic induction using Faraday's law (induced EMF = - N dPhi/dt) and Lenz's law, including motional EMF, eddy currents and the induction coil
A focused answer to the HSC Physics Module 6 dot point on electromagnetic induction. Faraday's law as EMF = -N dPhi/dt, Lenz's law and conservation of energy, motional EMF in a moving rod, eddy currents and damping, and the induction coil as a stepped-up pulse source.
10 min answer → - Describe how magnetic flux can be sensed by the changing alignment of a magnet on a compass needle and quantitatively analyse the concept of magnetic flux density B and flux Phi = B A cos theta in a magnetic field
A focused answer to the HSC Physics Module 6 dot point on magnetic flux. The definitions of flux density B (tesla) and magnetic flux Phi (weber), the cosine factor for tilted loops, and a worked rotating-coil example with the right traps highlighted.
7 min answer →