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The magnetic field at the earth's surface can vary in response to solar activity. During one...

The magnetic field at the earth's surface can vary in response to solar activity. During one intense solar storm, the vertical component of the magnetic field changed by 2.8 μT per minute, causing voltage spikes in large loops of the power grid that knocked out power in parts of Canada.What emf is induced in a square 150 km on a side by this rate of change of field?

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