RJC 2017 16 Electromagnetism notes

se©¥ection for charged partic©¥es. ţ (m ) explain how e©¥ectric and m agnetic fields can be used in velocity uniform electric and uniform m agnetic fie©¥ds. [ ćļyjjabū¡½ (I) describe and analyse def©¥ections of beam s f©¥m©¥es by (k) recall and solve problem s using F = B Q v sin 6 . ©¤ ü) predict the direction of the force on a charge m oving in a m agnetic the direction of the forces. (i) explain the forces between current - carrying conductors and predict using a current balance. conductor can be used to m easure the flux density of a m agnetic fie©¥d (h) show an understanding of how the force on a current - c a iT ying (g) defl e m agnetic f©¥ux density and the tesla. directions as interpreted by F lem ing ' s le ft - hand ru©¥e . (f) recall and so©¥ve problem s using the equation F = B IL sin Q , w ith m agnetic field m ight experience a force. (e) show an understanding that a current - c a r r ying conductor p©¥aced in a be inf©¥uenced by the presence of feiT ous core . (d) show an understanding that the m agnetic fie©¥d due to a solenoid m ay ©¥ong so©¥enoid respectively . fields due to ' currents in a long straight w ire, a f©¥at circular coil and a 2 trd 2 r use B - , B - / ©¥oN l and B ¡¤ llonl for the f©¥ux densities of the (c) circular coi©¥ and a long solenoid . (b) sketch flux patterns due to currents in a ©¥ong etralght w ire , a ¨¤at perm anent m agnets. of force produced either by current - c a r r ying conductora or by (a) show an understanding that a m agnetic field ©¥a an exam ple of a fie©¥d C andldales shou©¥d be able to üÞ L oarnlng O utcom o8 F o r ce on a mo v i ng ch a r ge I Not In H1 ryllabusl * F o rce b e tw e e n cu rre nt - c a r r ying conductors F o r ce on a currenlarrying conductor * M a g n e tic fie ld s d u e I o c u rre n ©¥s C o n c ep t of a ma g n e t ic fie©¥d ¨¡ntent

are produced by static charqes. experienced by mo v ©¥n g à¤画 as opposed to elė ctń ç lields, w hich It is ©¥m portant to note that m agnetic fields are produced and flux density is a A m agnetic field is a region of space w here a m agnetic pole the other. the interaction be©¥w een one m agnet and the m agnetic field of o T he force exerted by one m agnet on another m agnet is due to A m agnet sets up a m agnetic field in its vicinity . m agnetic field m agnetic field. C oncept of a F orces betw een m agnets can be explained using the concept of a ņ the m agnet and the other the south po©¥e. (v) T he pole that points tow ards the north is called the north pole of the E arth ' s N orth - S outh axis. align so that the line joining its poles is approxim ately parallel to (iv) W hen no other m agnet is near, a * eely suspended m agnet w i©¥©¥ (iii) P o©¥es occur in equal and opposite pairs (dipoles) . Oi) Like poles repel each other, u n like poles attract. (i) M agnetic poles are of 2 kinds : N orth (N ) or S outh (S ) E xperim ents have shown that m agnet called poles. T h e ma gn e tic