A coaxial cable consists of a long metal cylinder with radius r1=0.70mm and an outer metal cylindrical shell, centered around the inner cylinder, of inner radius r2=4.4mm and outer radius r3=7.9mm( the space between them is filled with air) Air “breaks down” and sparks if the electric field becomes stronger than 3MN/C(megaNewton per Coulomb) What is the largest charge per unit length that can be placed on the inner cylinder, before there is electrical breakdown? What is the charge per unit area on the inner surface of the cylindrical shell when this maximum charge-per-length is placed on the cylinder?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.