The two concentric cylinders have radii of 4cm and 8cm. The charge of the inner cylinder per unit length is q1 = 8micro C. The charge of the outer cylinder per unit length is q2 = -9 microC. What is the electric field N / C at a point r = 2cm from the center of 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.