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

question 42

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 current 2.4 s after the loop begins expanding.

• A)0 A
• B)1.3 * 10^-3 A
• C)1.6 * 10^-3 A
• D)8.0 * 10^-4 A
• E)2.1 * 10^-3 A

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