Charge is distributed with uniform surface charge density sigma on a circular disc with radius a. the disc lies in the xy plane with center at the origin. find the electric field at a point (o, o, z) on the z-axis. explicitly calculate the limiting forms of the solution at very small (z < < a) and at very large (z > > a) z compared to a.

photocells convert light energy to electricity

a

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.

96.77 amp

explanation:

rl = 250/100 = 2.5 ohms.

egl = 250 + (100 × 0.1) + 2 = 262 v.

at 700 r.p.m., eg2 = 262 × 700/1000 = 183.4 v.

if ia is the new current, then eg2 - 2 - (ia × 0.1) = 2.5 ia

which means this will give ia = 96.77 amp.