Two metallic spheres are placed 50 cm apart. Point P is 25 cm above the midpoint of the two spheres. A charge of +20 μC is initially applied to the surface of sphere A, while sphere B remains uncharged. A 50 cm B 25 cm 3. Calculate the electric field at point P due to sphere A. Mathematically, the charge distributed over the the surface of a sphere can be treated as if all the charge is concentrated at its center. Spheres A and B are brought into contact for a few moments and then placed in their original positions. 4. Determine the number of electrons that were transferred from sphere B onto sphere A. 5. Calculate the new electric field at point P due to both spheres.

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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.