A square loop of side 10cm and R=0.70 ohm is placed vertically in the east-west plane.A uniform magnetic field of 0.10T is set up across the plane in the north-east direction.The magnetic field is decreased to zero in 0.70s at a steady rate.Determine the magnitudes of induced emf and current during this time interval.

Actually my main doubt is that, I know that the value of theta between B and A will be 45° but I don't know that how the value came to be 45° here.

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Solution

The angle θ made by the area vector of the coil with the magnetic field is 45°.

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