1.

The flux linked per each turn of a coil of N turns changes from phi_1to phi_2. If the total resistance of the circuit including the coil is R. The induced charge in the coil is _____

Answer»

`(N(phi_2-phi_1))/t`
`(N(phi_2-phi_1))/R`
`(N(phi_2-phi_1))/(Rt)`
`N(phi_2-phi_1)`

Solution :The change in flux ASSOCIATED with coil of N TURN
`Deltaphi=Nphi_2-Nphi_1`
`therefore Deltaphi=N(phi_2-phi_1)`
INDUCED emf in coil `|epsilon|=N(Deltaphi)/(DELTAT)`
`therefore IR=N(Deltaphi)/(Deltat) "" [because |epsilon|=IR]`
`therefore Q/(Deltat)=(NDeltaphi)/(RDeltat)`
`therefore Q=(N(phi_2-phi_1))/R`


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