Hasnain Razak khatriJun 24, 2026
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20 Magnetic fields
20.1 Concept of a magnetic field
Candidates should be able to:
1 understand that a magnetic field is an example of a field of force produced either by moving charges or
by permanent magnets
2 represent a magnetic field by field lines
20.2 Force on a current-carrying conductor
Candidates should be able to:
1 understand that a force might act on a current-carrying conductor placed in a magnetic field
2 recall and use the equation F = BIL sin θ, with directions as interpreted by Fleming’s left-hand rule
3 define magnetic flux density as the force acting per unit current per unit length on a wire placed at rightangles to the magnetic field
20.3 Force on a moving charge
Candidates should be able to:
1 determine the direction of the force on a charge moving in a magnetic field
2 recall and use F = BQv sin θ
3 understand the origin of the Hall voltage and d
