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A long silver rod of radius 4 cm has a charge of -4μC/cm on its surface. (a) Find the electric field (in N/C in the r direction) at a point 9 cm from the center of the rod (an outside point). N/Cr (b) Find the electric field (in NC in the r direction) at a point 1 cm from the center of the rod (an inside point). N/Cr
Sagot :
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