This problem checks that you can use the formula that gives the electric field due to a spherical shell of charge. This formula can be calculated using the superposition principle 1 we discussed in class and gives 4m² outside the shell and zero inside the shell. The distance is the distance between the center of the shell and the point of interest. Consider a sphere with radius 4 cm having a uniformly distributed surface charge of +39 nC. What is the magnitude of the electric field it creates at a point 8 cm from its center, in units of kN/C?

Q: is that -14.31mm?

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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.