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Q. Two charged balls are 20.0 cm apart. They are moved, and the force on each of them is tripled. How far apart are they now?

Q. A circular loop of radius 20 cm is placed in an external magnetic field of strength 0.10 T so that the plane of the loop is perpendicular to the field. The loop is pulled out of the field in 0.30 s. Find the average induced emf during this interval.

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