A ball suspended by a thread which is 1 m long is charged with +0.1 microcoulomb . It is then whirled very rapidly ina vertical plane at right angle to the magnetic meridian at the rate of 10 revloutions per second. What is the magnetic moment associated with his motion of the ball? If to an observer to the north of it, ball appears to rotate in the clockwise , what is the specific direction of this magnetic moment ?

In a hydrogen atom the electron moves in an orbit of radius 0.5 Ao making 10 revolutions per second, the magnetic moment associated with the orbital motion of the electron will be

A metal rod 1.5m long rotates about its one end in a vertical plane at right angles to the magnetic meridian. If the frequency of rotation is 20 rev s^(-1) , find the emf induced between the ends of the rod (B_(H) = 0.32G) .

A ball suspended by a thread swings ia a vertical plane so that its acceleration in the extreme position and lowest position are equal. The angle theta of thread deflection in the extreme position will be

A ball suspended by a thread swings in a vertical plane so that its acceleration in the extreme position and lowest position are equal. The angle  of thread deflection in the extreme position will be - 2

A tennis ball was observed to travel at a speed of 96 miles per hour. Calculate the speed of the ball in metres per second.

A magnetic needle is free to rotate in a vertical plane which makes an angle of 60^@ with the magnetic meridian. If the needle stays in a direction making an angle of tan^-1(2//sqrt3) with the horizontal, what would be the true dip at that place?

A small ball is suspended from a point O by a light thread of length l. Then the ball is drawn aside so that thread deviates through an angle theta from the vertical and set in motion in a horizontal direction at right angles to the vertical plane in which the thread is located. What is the initial velocity that has to be imparted to the ball so that it could deviate through the maximum angle pi//2 in the process of motion?