In a Geiger counter, a thin metallic wire at the center of a metallic tube is kept at a high voltage with respect to the metal tube. Ionizing radiation entering the tube knocks electrons off gas molecules or sides of the tube that then accelerate towards the center wire, knocking off even more electrons. This process eventually leads to an avalanche that is detectable as a current. A particular Geiger counter has a tube of radius R and the inner wire of radius a is at a potential of Vo volts with respect to the outer metal tube. Consider a point P at a distance s from the center wire and far away from the ends. Required:
a. Use Vo = 900 Va = 3.00 mm, R = 2.00 cm, and find the value of the electric potential at a point 1.00 cm from the center of the wire (with respect to the outer metal tube).
b. Find a formula for the electric potential at a point P inside.
c. Use Vo = 900 V, a = 3.00 mm, R = 2.00 cm, and find the value of the electric field at a point 1.00 cm from the center.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

What should the power status of a circuit be when measuring resistance with an ohmmeter?

In a thunderstorm, charge builds up on the water droplets or ice crystals in a cloud. thus, the charge can be considered to be distributed uniformly throughout the cloud. for the purposes of this problem, take the cloud to be a sphere of diameter 1.00 kilometer. the point of this problem is to estimate the maximum amount of charge that this cloud can contain, assuming that the charge builds up until the electric field at the surface of the cloud reaches the value at which the surrounding air breaks down. this breakdown means that the air becomes highly ionized, enabling it to conduct the charge from the cloud to the ground or another nearby cloud. the ionized air will then emit light due to the recombination of the electrons and atoms to form excited molecules that radiate light. in addition, the large current will heat up the air, resulting in its rapid expansion. these two phenomena account for the appearance of lightning and the sound of thunder. take the breakdown electric field of air to be eb=3.00ă—106n/c. part a estimate the total charge q on the cloud when the breakdown of the surrounding air is reached. express your answer numerically, to three significant figures, using ďµ0=8.85ă—10â’12c2/(nâ‹…m2) .