An Elastic Circular Conducting Loop Expands at a Constant Rate $\varOmega$

question 57

Multiple Choice

An elastic circular conducting loop expands at a constant rate in time.The radius is initially 0.200 m,but then begins to increase 0.018 m every second.The loop has a constant resistance of 15 $\varOmega$ and is placed in a region of uniform (same everywhere) magnetic field of 0.880 T,perpendicular to the plane of the loop.Calculate the magnitude of the induced EMF 2.4 s after the loop begins expanding.

• A)31.2 mV
• B)24.2 mV
• C)22.3 mV
• D)28.0 mV
• E)19.9 mV

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