An Ac Generator Consisting of a Coil With $N$ Turns Rotating at Angular Speed

question 72

Multiple Choice

An ac generator consisting of a coil with $N$ turns rotating at angular speed $\omega$ in an external magnetic field $B$ produces a maximum emf $\varepsilon _ { 0 }$ . If you now decrease the number of turns in the coil to $N / 2$ and at the same time cause it to rotate twice as fast, what will be the new maximum emf if you do not change any of the other quantities?

• A) \(4 \varepsilon _ { 0 }\)
• B) \(\varepsilon _ { 0 } / 4\)
• C) \(\varepsilon _ { 0 }\)
• D) \(2 \varepsilon _ { 0 }\)
• E) \(\varepsilon _ { 0 } / 2\)

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