GCE A-Level Physics Syllabus

Chapter 16: Electromagnetism

Chapter Topics:

Concept of a magnetic field
Magnetic fields due to currents
Force on a current carrying conductor
Force on a moving charge

Question Bank:

Learning Objectives:

(a) Show an understanding that a magnetic field is an example of a field of force produced either by current-carrying conductors or by permanent magnets.

(b) Sketch flux patterns due to currents in a long straight wire, a flat circular coil and a long solenoid.

(c) Use B = μ₀I/2πd, B = μ₀NI/2r and B = μ₀nI for the flux densities of the fields due to currents in a long straight wire, a flat circular coil and a long solenoid respectively.

(d) Show an understanding that the magnetic field due to a solenoid may be influenced by the presence of a ferrous core.

(e) Show an understanding that a current-carrying conductor placed in a magnetic field might experience a force.

(f) Recall and solve problems using the equation F = BIl sin θ, with directions as interpreted by Fleming’s left-hand rule.

(g) Define magnetic flux density.

(h) Show an understanding of how the force on a current-carrying conductor can be used to measure the flux density of a magnetic field using a current balance.

(i) Explain the forces between current-carrying conductors and predict the direction of the forces.

(j) Predict the direction of the force on a charge moving in a magnetic field.

(k) Recall and solve problems using the equation F = BQv sin θ.

(l) Describe and analyze deflections of beams of charged particles by uniform electric and uniform magnetic fields.

(m) Explain how electric and magnetic fields can be used in velocity selection for charged particles.