A ball of mass m with a charge q can rotate in a vertical plane at the end of a string of length l in a uniform electrostatic field whose lines of force are directed upwards. What horizontal velocity must be imparted to the ball in the upper position so that the tension in the string in the lower position of the ball is 1.5 times than the weight of the ball?

A ball of mass 1 g having a charge of 20 mu C is tied to one end of a string of length 0.9 m can rotate in a vertically plane in a uniform electric minimum horizontal velocity that must be given to the ball at the lowest position so that is complete the verticle circle is (let g= 10 ms^(-1))

A small ball of mass m having charge q is suspended by a string of length L . Another identical ball having the same charge is kept at the point of suspension. Determine the minimum horizontal velocity which should be imparted to ball at lowest point so that it can make complete revolution.

A small ball having charge +q and mass m is suspended at one end of a light string of length and can rotate in vertical plane.A uniform electric field E exists in the region in vertically upward direction (mg>qE) .The minimum velocity required to be imparted to the ball at the lowest position in order to successfully negotiate the circular loop is sqrt(x(g-(qE)/(my))) then find x+y . x & y are lowest possible integer.

a ball of mass 240g is attached to the verticle rod by means of two strings. When the ball rotates about the axis of rod, the strings are extended as shown in the figure. (a) find the angular speed of the ball if tension in lower string is 16N . (b) What is tension in the upper string?

A ball of mass m is attached to one end of a light rod of length l , the other end of which is hinged. What minimum velocity v should be imparted to the ball downwards, so that it can complete the circle ?

A ball of mass m is attached to one end of a light rod of length l , the other end of which is hinged. What minimum velocity v should be imparted to the ball downwards, so that it can complete the circle ?