Approximate a metal needle as a long cylinder with a very pointed, but slightly rounded, end. Sketch the charge distribution and outside electric field lines if the needle has an excess of electrons on it.
Answer to relevant QuestionsAn electrically neutral thin, square metal slab, measuring 5.00 cm on a side, is placed in a uniform external field that is perpendicular to its square area. (a) If the top of the slab becomes negatively charged, what is ...A negatively charged pith ball (mass 6.00 x 10-3, charge – 1.50nC) is suspended vertically from a light nonconducting string of length 15.5 cm. This apparatus is then placed in a horizontal uniform electric field. After ...An electric dipole has charges of ± 4.55pC that are separated by 6.00 cm. The dipole lies on the x-axis and its center is at the origin. Located at y = + 4.00 is a point charge carrying a charge of – 2.50pC. (a) ...If the plates of an isolated parallel plate capacitor are moved farther apart from each other, does the energy storage increase, decrease, or remain the same? Explain. You have N (an even number ≥ 2) identical capacitors, each with a capacitance of C. In terms of N and C, what is their total effective capacitance? (a) If they are all connected in series? (b) If they are all connected ...
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