Aspherical capacitor is formed from two concentric spherical conducting shells separated by vacuum. the inner sphere has a radius of ra = 12.3 cm , and the outer sphere has a radius of rb = 15.1 cm . a potential difference of 120 v is applied to the capacitor.

(a) what is the capacitance of the capacitor?
(b) what is the magnitude e1 of the electric field e? at radius r= 12.8cm, just outside the inner sphere?
(c) what is the magnitude of e? at r= 14.7cm, just inside the outer sphere?

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) .

When does your body conduct current more readily?

For this car, predict the shape of a graph that shows distance (x) versus time (t). note that time is the independent variable and will be on the bottom axis. need asap