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A coil having N turns and area A is rotating in uniform magnetic field then at time t, the magnetic flux associated with the coil is given by phi=NAB cos omegat . In the first rotation at time t = . . s, the induced emf is obtained maximum. |
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Answer» `T/2` `(dphi)/(dt)=-N AB omega SIN omegat ` `therefore -V=-N AB omega sin omegat` `therefore V=N AB omega sin omegat` …(1) If sin `omegat= 1 RARR V=V_m` `therefore V_m = NAB omega` `therefore` From EQ. (1) `V=V_m sin omegat` If `V=V_m` `1=sin omegat` `therefore omegat =pi/2` and `(3pi)/2` `therefore (2pi)/T xx t = pi/2` and `(2pi)/T xx t = (3pi)/2` `therefore t=T/4` and `t=(3T)/4` |
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