4) a) Planes x = 2 and y = -3, respectively, carry charges 20nC/m² and 10nC/m². If the line x = 0, z = 2 carries charge 10n nC/m, calculate Ē (1,1, – 1). b) Find É (4,0,3) if there is a point charge -5T mC at (4,0,0) and a line charge 3t mC/m along the y-axis.
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