Related InterviewSolutions

• Eight identical point charges of q coulomb each are placed at the corners of a cube side 0.1m. Calculate electric field at the centre of the cube. Calculate the field at the center when one of the corner charges is removed.
• How many electrons are there in one coulomb of negative charge?
• A stream of electrons moving with a velocity of `3xx10^(7) ms^(-1)` is deflected by 2 mm in traversing a distance of 0.1 m in a uniform electric field of strength `18 Vm^(-1)` in Fig. 1.42. An electron enters the field symmetrically between the plates with a speed `upsilon_(0)`. The length of each plate is l. Find the angle of deviation of the bath of the electron as it comes out of the field.
• Obtain the dimensional formula of `epsilon_(0)`.
• Calculate the coulomb force between two electrons separated by `0.8xx10^(-15) m`.
• A simple pendulum consists of a small sphere of mass `m` suspended by a thread of length `l`. the sphere carries a positive charge `q`. The pendulum is placed in a uniform electric field of strength `E` directed vertically upwards. With what period will pendulum oscillate if the electrostatic force acting on the sphere is less than the gravitational force ?
• Two pith ball of mass 0.5 each are suspended from a common point O by means of silk threads, each of length 20 cm. When the balls are given equal and similar charges, they repel each other so that the two threads make an angle of `60^(@)` with each-other. Determine the charge on each ball.
• Two small spheres each of mass m are suspended from a common point by threads 0.5 m long. They are equally charged and repel each other to a distance of 0.28m. If `=g10ms^(-2)`, what is the charge on each sphere?
• If an oil drop of weight `3.2xx10^(-13) N` is balanced in an electric field of `5xx10^(5) Vm^(-1)`, find the charge on the oil drop.
• Two particles (free to move) with charges `+q` and `+4q` are a distance L apart. A third charge is placed so that the entire system is in equilibrium. (a) Find the location, magnitude and sign of the third charge.(b) Show that the equilibrium is unstable.