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Give the expression for maximum induced emf in an ac generator. |
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Answer» Solution :Let the call be rotating with angular velocityat any INSTANT .t. when the normal to the plane of the coil makes an angle `THETA`with the magnetic field. Hence magnetic flux, `phi = NBA cos omega t`,There for induced EMF `(epsilon)` `epsilon = -(d phi)/(d t)` `rArr epsilon = NBA omega SIN omega t` Induced emf will be maximum when `omega t = 90^(@)` Hence, `epsilon_(max) = NBA omega` Direction of induced emf can be determined using Flemming.s right hand rule. [ALTERNATIVELY :Statement of the above rule.] |
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