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Identify the device X and write the expression for its rectance |
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Answer» Solution :The AC Generator works on the principle of electromagnetic indunction When the magnetic flux through a coil CHANGES . An emf is induced in it. As the coil rotates in magnetic field the effective area of the loop (I.e. A` cos theta` ) exposed to the magnetic field KEEPS on changing ,hence magnetic flux changes and an emf is induced  When a coil is rotated with a constant angular speed `omega` the angle ` theta` between the magnetic field vector ` oversetto B` and the area vector ` oversetto A ` , of the coil at any instant .t. equal cot : (assuming ` theta =O^(@) at t =0) ` As a result , the effective area of the coil exposed to the magnetic ,field changes with time , the flux any instant .t. is given by `PHI _n=NBA cos theta =NBA cos theta` ` therefore`The induced emf `=-N(dphi )/( DT )` ` = NBA = ( d)/( dt) (cos omega t) ` e= NBA `omega sin omegat ` |
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