Temporally changing magnetic flux through a conductive loop creates (induces) electromotive force (and current) in the loop. Electromotive force is proportional to negative rate of change of the flux. This is Faraday's law of induction.
In 1831 Michael Faraday was able to show that changing electric current in primary coil creates changing magnetic field that induces current in secondary coil pierced by the same magnetic flux. As a result induced magnetic field was detected by a compass placed in the secondary coil.
In 1831 Michael Faraday was able to show that changing electric current in primary coil creates changing magnetic field that induces current in secondary coil pierced by the same magnetic flux. As a result induced magnetic field was detected by a compass placed in the secondary coil.
The flux changes if B or A or angle or N or all change as a function of time, try with Pick up coil. The brightness of the lamp indicates the strength of the induced current. What about if you vary the rate of change?
Estimate the electric current (GI-current) induced in 400 kV transmission line in the case the vertical component of the geomagnetic field is decreassing from 48400 nT to 47180 nT in a minute. The transmission line makes a polygon in the Southern Finland as shown below. The resistance of the line is 0,9 mohm/km.
Ei kommentteja:
Lähetä kommentti