A small particle carrying a negative charge of `1.6xx10^-19` C is suspended in equilibrium between the horizontal metal plates 5 cm apart, having a potential difference of 3000 volt across them. Find the mass of the particle.

Two parallel plates are 5 cm apart and a potential difference of 6- V is set up across them. Find the electric field intensily between the two plates.

A water particle of mass 10 mg and having a charge of 1.5 xx 10^-6C stays suspended in a room. What is the magnitude and direction of the electric field in the room?

Separation between two parallel pates facing each other is 2 cm and surface are l^2 = 100 cm^2 . If 10^6 electrons of velocity 10^8 ms^-1 projected into the gap between the plates kept at a potential difference of 400 V, find the deflection of an electron.

The Millikan oil-drop experiment enabled the charge on the electron to be deterined. Two parallel metal plates P and Q are situated in a vaccum. The plates are horizontal and separated by a distance of 5.4 mm, as illustrated in fig. The lower plate P is earthed. The potential difference between the plates can be varied. An oil droplet of mass 7.7 xx 10^-15 kg is oserved to remain stationary between the plates , when palte Q is a t a potential of +850 suggest why plates p and Q must be parallel and horizontal and calcualte the charge with its gin, on the oil droplet.

An air capacitor has an area of 1,000 cm^2 and the two plates are 4 mm apart. It is connected in series with another capacitor having a plate ares of 20 cm^2 , the plates being separated by a dielectric 0.1 mm thick having dielectric constant o 2.5 . If the potential difference across the second capacitor is 100 V, find the voltage applied across the series combination.

In a parallel plate capacitor with air between the plates, each has an area of 6xx10^-3m^-2 and the distance between the platesw is 3mm. Calculate the capacitance of the capacitor, If this capacitor is Connected to 100 V supply, what is the charge on each plate of the capacitor? (Given varepsilon_0=8.5xx10^-12C^2N^-1m^-2)

Two cells of e.m.f. of 1.6 V and 2.4 V have internal resistance 2 and 4 respectively. The two resistance wires positive poles are connected to resistance of 6 and negative poles connected to 8 ohm. If another wire of 10 is connected between the mid-points of these wires, what is the potential difference across it.

A charged particle having a charge of -3muC is placed close to a sheet of charge having a surface charge density 5xx10^-6 Cm^-2 . Find the force of attraction between the particle and the sheet of charge.