147. A long cylinder with uniformly charged surface and cross-sectional
radius a = 1.0 cm moves with a constant velocity v = 10 m/s along its
axis. An electric field strength at the surface of the cylinder is equal to
E = 0.9 kV/cm. Find the resulting convection current, that is the
current caused by mechanical transfer of a charge.
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Answer: E*2*3.14*Eo*a*v
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