Practice question · Put in order
A magnet is moved through a coil at four different speeds. Order the situations from the smallest induced voltage to the largest.
- The magnet is held completely still
- The magnet is eased through very slowly
- The magnet is thrust through very fast
- The magnet is moved through at a moderate speed
Hints
- The induced voltage depends on the RATE at which the flux changes.
- A stationary magnet changes the flux at a rate of zero.
Show the answer
- The magnet is held completely still
- The magnet is eased through very slowly
- The magnet is moved through at a moderate speed
- The magnet is thrust through very fast
Why
Faster motion means a faster change of flux and so a larger induced voltage, with the stationary case giving exactly zero. This is why a generator must be spun and why spinning it harder produces more voltage.
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