A small ball is suspended over an infinite horizontal conducting plane by means of an insulating elastic thread of stifiness `k`. As soon as the ball was charged it decended by `x cm` and its separation from the plane become equal to `l`. Find the charge of the ball.

A small ball carring 1mu C of change is suspended over an infinite horizontal conducting plane by means of an insulating spring of force constant 100Nm^(-1) Calculate the increase In length of the spring if the plane has a surface density of change equal to -8.85xx10^(-6) Cm^(-2)

A small ball of mass m=21 g suspended by a insulating thread at a height h=12 cm from a large horizontal conducting plane performs small oscillations (figure) . After a charge q had been imparted to the ball, the oscillation period changed eta=2.0 times. Find q .

(A): A small metal ball is suspended in a uniform electric field with an insulated thread. If high energy X-ray beam falls on the ball, the ball will be deflected in the electric field. (R ): X-rays emits photoelectron and metal becomes negatively charged.

Statement-1: A small metal ball is suspended in a uniform electric field with an insulated thread. If high energy X-rays beam falls on the ball, the ball will be declected in the electric field. Statement-2: X-rays emit photoelectrons and metal and metal becomes negatively charged.

(A): A small metal ball is suspended in a uniform electric field with an insulated thread. If high energy X-ray beam falls on the ball, the ball will be deflected in the electric field. (R ): X-rays emits photoelectron and metal becomes negatively charged.

Two pith balls of mass 10mg each are suspended by two threads from the same support are charged identically. They move apart by 0.08m and threads make an angle 60^@ with each other. Find the charge on each pith ball

A small metal ball of mass m is suspended from a thread of length l between the plates of a large plane capacitor. How will the period of oscillations of such a pendulum change, if a charge + q is placed on the ball and the upper plate is negatively charged?

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.

A small ball is suspended from a fixed point 'O' by means of a light and inextensible string of length 'l'. The ball is first taken aside such that string becomes horizontal and then released from rest. At the borrom it collides with a fixed obstacle. The co-efficient of restitution is 'e'. Find the maximum angular deflection of the string after n^(th) collision.

A small ball is suspended from a fixed point 'O' by means of a light and inextensible string of length 'l'. The ball is first taken aside such that string becomes horizontal and then released from rest. At the borrom it collides with a fixed obstacle. The co-efficient of restitution is 'e'. Find the maximum angular deflection of the string after n^(th) collision.