Electromagnetism
Gbogbo ọrọ náà
Every fan, every washing machine drum and every loudspeaker cone moves for the same reason: a wire carrying a current, sitting in a magnetic field, gets pushed. Nothing touches it, and the push can be reversed by flicking a switch.
In this lesson you will see how a current creates a magnetic field of its own, why that field makes the wire feel a force when it meets another one, how to predict which way the force acts using Fleming's left-hand rule, and how motors and loudspeakers put the effect to work.
Ebumnobi
- Know that an electric current in a conductor produces a magnetic field around it
- Understand why a force is exerted on a current-carrying wire in a magnetic field, and how this effect is applied in simple d.c. electric motors and loudspeakers
- Use the left-hand rule to predict the direction of the resulting force when a wire carries a current perpendicular to a magnetic field
- Describe how the force on a current-carrying conductor in a magnetic field changes with the magnitude and direction of the field and current
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Electromagnetism. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- The magnetic field around a long straight current-carrying wire is: A) Straight lines along the wire B) Circles centred on the wire C) The same shape as a bar magnet field D) Uniform in all directions Answer: B
- Fleming's left-hand rule is used to find the direction of the: A) Magnetic field around a wire B) Current induced in a moving wire C) Force on a current-carrying wire in a magnetic field D) Current in a transformer Answer: C
- In Fleming's left-hand rule, the first finger represents the: A) Force B) Field C) Current D) Motion Answer: B
- The current in a wire between the poles of a magnet is reversed and the magnet is also turned round. The force on the wire: A) Is unchanged in direction B) Reverses direction C) Becomes zero D) Doubles in size Answer: A
- The force on a current-carrying wire in a magnetic field is zero when the wire is: A) At right angles to the field B) Parallel to the field C) Carrying a large current D) Between strong magnets Answer: B
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Electromagnetism? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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