1.A spherical condenser has inner and outer spheres of radii a and b respectively. The space between the two is filled air. The difference between the capacities of the two condensers formed when outer sphere is earthed and when inner sphere is earthed will be.........? Explain.

Question

1.A spherical condenser has inner and outer spheres of radii a and b respectively. The space between the two is filled air. The difference between the capacities of the two condensers formed when outer sphere is earthed and when inner sphere is earthed will be.........? Explain.
2. Charged  pendulums are in equilibrium, making angle A, this arrangement is taken to rotating satellite, what will be the new value of A?

bobpursley · Answer

There is no difference. THe capacitance is determined by the voltage difference between the spheres, and the two radii.
http://www.mwit.ac.th/~physicslab/hbase/electric/capsph.html

On earth, the charges repel, and the forces pulling the pendulum down is gravity. I orbit, gravity is equalled by centripetal force, giving the effect of no gravity, so the pendulums will be at 180 degrees.

Sandhya · Answer

Thanks