when a piece of rectangular glass block is inserted between two parallel capacitor,at constant plate area and distance of separation, the capacitance of the capacitor will

the ratio of electrostatic force F_E to gravitational force F_G between two protons each of charge e and mass m, at a distance d is

A cell can supply current of 0.4 A and 0.2 A through a 4.0Ω and 10.0Ω resistors respectively.
This internal resistance of the cell is

The particles emitted when \( ^{39}_{19}K \text{ decay to } ^{39}_{19}K \) is

I. Low pressure.
II. High pressure.
III. High p.d.
IV. Low p.d.
Which combination of the above is true of the conduction of electricity through gases?