Recent content by luckyducky

Electric field inside the bulb! There are 6.3e28 mobile electrons per cubic meter in tungsten. The cross-sectional area of the tungsten filament in bulb B1 is 0.01 mm2 (1 mm2 = 1e-6 m^2). The electron mobility in hot tungsten is 1.2e-4 (m/s)/(N/C). Calculate the magnitude of the electric field...

This is what I did? Ok this is what I did but don't know whether it is right or not: E = 1/(4 pi epslon) * Q/d^2 is the electric field of the pen I said that the aluminium foil works like a capacitor therefore: (qA)/epsilon - 1/(4 pi epslon) * Q/d^2 = 0 also Q=10 nanoC the...

Homework Statement A clear plastic pen of length 14.5 cm is rubbed with wool. The charged plastic pen is held over a small uncharged disk shaped piece of aluminium foil of diameter 0.5cm. How close you must move the pen to the foil in order to pick up the foil? The Attempt at a...

What can I do I am new to this topic and don't know much about it.

Hi, I have a question I really need the answer to this immediately please please help me I am really stressed out: Question = A nucleus contains Z protons which on average are uniformly distributed throughout a tiny sphere of radius R. Find the potential (relative to infinity) at the center...