A spherical balloon with a volume of 2.5 L is in a 45 mT uniform, vertical magnetic

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A spherical balloon with a volume of 2.5 L is in a 45 mT uniform, vertical magnetic field. A horizontal elastic but conducting wire with 2.5 Ω resistance circles the balloon at its equator. Suddenly the balloon starts expanding at 0.75 L/s .
What is the current in the wire 2.0 s later?

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