practical 11 - magnetic flux linkage

• equipment

  • oscilloscope
  • large circular coil
  • stands
  • 50Hz AC supply
  • protractor card
  • search coil
• method

  • mount circular coil vertically with stanf and position search coil at centre of circular coil
  • search coil should be parallel to circular coil
  • connect circular coil to AC supply and search coil to oscilloscope
  • protractor card placed underneath two coils
  • turn on the AC supply
  • select suitable voltage sensitivity and time base settings and record peak to peak value of induced AC voltage
  • tilt search coil so angle between two coils increases by 10 degrees repeat increasing by 10 degrees up to 90 degrees
  • repeat experiment twice more and record mean value of induced emf for each angle
• graphs and calculations

  • find $\cos\left(\theta\right)$ for each angle and tabulate
  • plot graph of induced emf against $\cos\left(\theta\right)$
  • straight line through origin
  • induced emf proportional to cosine of the angle
  • $\epsilon=$$BAN\omega\cos\left(\theta\right)$
• safety

  • no notable risks
• improvements

  • read angle off protractor from far above to reduce parallax error or use set square