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AP® Physics C: E & M

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Moderate

Compare Radius and Loops

APPHEM-04TEVN

A coil with 10 loops and a radius of $R$ along with a different coil of one loop with a radius of $4R$ are both pulled out of the same $B$ field in the same amount of time. Compare the magnitude of the EMF's produced.

A

Loop $4R$ has $16 \times $ bigger emf than loop $R$.

B

Loop $4R$ has $\cfrac {1}{10}$ the emf of loop $R$.

C

Loop $ 4R$ has about $\cfrac {2}{3}$ the emf of loop $R$.

D

Loop $4R$ has $1.6\times$ the emf of loop $R$.

E

Loop $4R$ has the same emf of loop $R$.