# Briefly explain the flux change by rotation of loop?

Rate of change of Magnetic flux due to change in the orientation of the loop:-

A loop having are ‘A’ is rotating about an axis with a constant angular velocity ‘ω’ as shown in the figure. Due to this rotation, the orientation of the loop is changing w.r.t the field direction. As a result there is a rate of change of magnetic flux passing through the loop. This is inducing an alternating EMF. This is nothing but a prototype of A.C generator or Alternator.

$,,,phi =vec{B}.vec{A}$ $=BAcos theta =BAcos cot$ $frac{dphi }{dt}=-BAomega sin omega t$ $varepsilon =frac{-dphi }{dt}=BAomega sin omega t={{varepsilon }_{0}}sin omega t$