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Consider an air-filled coaxial cable with surface charge density of 1 nC/m² at the surface of inner conductor and -1 nC/m² at the surface of outer conductor. The radius of the inner
conductor is lcm whereas that of the outer conductor is 3cm. Find the electric field at a point that is midway between the surfaces of the inner and outer conductors (i.e. at 2 cm).
75.2 V/m
-113 V/m
56.5 V/m
113 V/m

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