15. The figure below shows two magnetic field regions: R1 is a region where ther

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15. The figure below shows two magnetic field regions: R1 is a region where there is a magnetic field going into the page with magnitude |B1(t)| = 2t R2 is a region where there is a magnetic field coming out of the page with magnitude |B2 (t)| = 1/t^2 In the above equations, t (where t > 0) is the time in seconds and IB(t)I is the magnetic field in Teslas. In addition, region R1 has cross-sections that are circles of radius 20. cm, and region R2 has cross-sections that are circles of radius 30.cm. What is the value of Integral L E.ds at t = 2.0 (magnitude and sign) for path L shown? A) +390 mV B) +570 mV C) -180 mV D) -320 mV E) -430 mV

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