Question

In an AC generator, a coil with $N$ turns, all of the same area $A$ and total resistance $R$, rotates with frequency $\omega$ in a magnetic field $B$. The maximum value of emf generated in the coil is:

• A. $N.A.B.R.\, \omega$
• B. $N.A.B$
• C. $N.A.B.R$
• D. $N.A.B.\, \omega$

Answer 1

Answer: (D)

$N.A.B.\, \omega$

Answer 2

The emf generated would be maximum when flux (cutting) would be maximum i.e., angle between area vector of coil and magnetic field is $0^??. The emf generated is given by [as a function of time]$e=NBA\omega,cos,\omega t$$\Rightarrow e_{max}=NAB\omega$