Two infinite line charges with uniform linear charge densities λ1 > 0 and λ2 < 0, are oriented parallel to the z-axis; see figure below. The first line charge intersects the x-axis at x = −3a while the other one at x = 9b, where a and b are both positive constants (in units of m). What is the net electric field at the origin due to these line charges?

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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.