Physics - electromagnetics

1. 1When a current passes through a conductor a [blank_start]magnetic[blank_end] field is created around it
   When an electric [blank_start]current[blank_end] flows in a wire it creates a [blank_start]magnetic[blank_end] field [blank_start]around[blank_end] the wire. By winding the wire into a coil we can strengthen the magnetic field. Electromagnets are made from coils like this.

   1. Amagnetic
   2. Bcurrent
   3. Cmagnetic
   4. Daround
2. 2By moving a compass around the wire we can determine the [blank_start]direction[blank_end] of the magnetic field

   1. Adirection
3. 3An electromagnet can be made when a [blank_start]current[blank_end] passes through a [blank_start]conductor.[blank_end]
   The electromagnet can be switched [blank_start]on[blank_end] and [blank_start]off[blank_end]
   The electromagnet can be made stronger
   - by increasing the number of [blank_start]turns[blank_end] in foil
   - increasing the [blank_start]current[blank_end] flowing through it
   - using a soft [blank_start]iron[blank_end] core (eg a nail)

   1. Aconductor.
   2. Bon
   3. Coff
   4. Dcurrent
   5. Eturns
   6. Fcurrent
   7. Giron
4. 4Use of electromagnetics:

   1. AJunk yard crane
   2. BSurgical tools (eyes)
   3. CBells (electric)
   4. DMotorised Hand whisk
   5. EHairdryer
5. 5An electric [blank_start]current[blank_end] in a conductor produces a [blank_start]magnetic[blank_end] field. Electric motors and loudspeakers both use electromagnets. These are made by coiling [blank_start]wire[blank_end] carrying a [blank_start]current[blank_end] around a magnetic [blank_start]core[blank_end].

   1. Acurrent
   2. Bmagnetic
   3. Cwire
   4. Dcurrent
   5. Ecore

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Test sobre Physics - electromagnetics, creado por vivien.wheeler el 05/05/2016.

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vivien.wheeler

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