A ball having charge `q` and mass `m` is suspended from a string of length `L` between two parallel plates where a vertical electric field `E` is established . Find the time period of simple pendulum if electric field is directed (a) downward and (b) upward.

A particle of mass m and charge q is oscillating simple harmonically from a string of length l .Now a vertical electric field of magnitude E = (mg)/(2q) is switched on.The ration of new time period to old time period is

A positively charged particle of charge q and mass m is suspended from a point by a string of length l. In the space a uniform horizontal electric field E exists . The particle is drawn aside so that it is projected horizontally with velocity v such that the particle starts to move along a circle with same constant speed v. Find the speed v.

A simple pendulum of length L is placed between the plates of a parallel plate capacitor having electric field E, as shown in figure. Its bob has mass m and charge q. The time period of the pendulum is given by:

A simple pendulum of length L is placed between the plates of a parallel plate capacitor having electric field E, as shown in figure. Its bob has mass m and charge q. The time period of the pendulum is given by:

A simple pendulum of length L is placed between the plates of a parallel plate capacitor having electric field E, as shown in figure. Its bob has mass m and charge q. The time period of the pendulum is given by:

A particle of mass 'm' and charge 'q' is suspended from the ceiling with the help of an insulating wire of length 'l' . It is placed in an uniform electric field as shown in figure. Then the time period of oscillation is

A point charge q is situated at X between two parallel plates which have a potential difference V and carry charges +Q and -Q . What is the electric field strength at X ?

An electron having charge 'e' and mass 'm' is moving a uniform electric field E . Its acceleration will be

A ball of mass m having a charge q is released from rest in a region where a horizontal electric field E exists. (a) Find the resultant force acting on the ball. (b) Find the trajectory followed by the ball.

Two identical balls , each having a charge q and mass m , are suspended from a common point by two insultating strings each of length L . The balls are held at a separation x and then released. Find (a) the electric force on each ball (b) the component of the resultant force on a ball along and perpendicular to string (c ) the tension in the string (d) the acceleration of one of the balls. Consider the situation only for the instant just after the release.