ASRJC Electromagnetism Notes

ANDERSON SERANGOON JUNIOR COLLEGE PHYSICS 9749 16- 1 Additional Notes Topic 16: Electromagnetism Content: A Concept of a Magnetic Field B Magnetic fields due to currents C Effects of ferrous core on magnetic field of a solenoid D Force on a current-carrying conductor E Force between current-carrying conductors F Force on a moving charge Learning Outcomes: Candidates should be able to: (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 = µoI / 2πd, B = µoNI / 2r, and B = µonI 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 = B Il sin, with directions as interpreted by Fleming’s left hand rule. (g) define magnetic flux density. (h) show an understanding on 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 F = BQv sin. (l) describe and analyse deflections of beams of charged particles by uniform elect ric and uniform magnetic fields. (m) explain how electric and magnetic fields can be used in velocity selection for charged particles. μ0 = 4  10 -7 H m-1 Electromagnetism Lecture Plan Lect Concept Est. duration of videos Qns 1 A, B, C,D 43 min Eg1-3; CYU1 2 E Eg2-5 43 min Eg4,5; CYU2 3 F 48 min Eg6,7; CYU3,4

ANDERSON SERANGOON JUNIOR COLLEGE PHYSICS 9749 16-2 Additional Notes • Recall: ➢ A gravitational field i s a region in space where a mass would experience gravitational force acting on it. ➢ An electric field is a region in space where a force acts on a stationary charge. • Similarly, ➢ A magnetic field will be a region where a magnetic pole will experience a force. o However, it is not possible to have an isolated magnetic monopole as they always exist in pairs (i.e. North and South poles existing within same object), unlike charges which can exist as isolated positive or negative • Hence, a magnetic field is defined as: A region of space where a magnetic pole, a current-carrying conductor or a moving charged particle will experience a force. • The magnetic field may exist at a point as a result of the presence of: (a) either a permanent magn