An Ac Generator Consisting of a Coil with N Turns

question 72

Multiple Choice

An ac generator consisting of a coil with N turns rotating at angular speed ω in an external magnetic field B produces a maximum emf ε₀.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)4ε₀
• B)2ε₀
• C)ε₀
• D)ε₀/2
• E)ε₀/4

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