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THE FIGURE BELOW SHOWS A CROSS SECTION OF TWO LONG, THIN COAXIAL CYLINDERS
OF RADIUS a AND b. THE CYLINDERS CONTAIN EQUAL CHARGES A PER UNIT LENGTH AND
OPPOSITE SIGNS.
A POSITRON ROTATES IN A CIRCULAR PATH BETWEEN THE CYLINDERS AND CONCENTRIC
TO THEM. FIND ITS KINETIC ENERGY FOR À= 30 nC/m

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