CYLINDERICAL OR BALL ENDED MAGNETS

CONE + CYLINDER + HEMISPHERE : A toy is in the shape of a right circular cylinder with a hemisphere on one end and a come on the other. The height and radius of the cylinderical part are 13cm and 5cm respectively. The radii of the hemispherical and conical parts are the same as that of the cylinderical part. Calculate the surface area of the toy if height of the conical part is 12 cm.

a uniform magnetic field of induction B fills a cylinderical volume of radius R . A rod AB of length 2l is placed as shown in . If B changing at the rate dB//dt , the emf that is produced by the changing magnetic field and that acts between the ends of the rod is

STATEMENT-1 : If a hole were drilled through the centre of the earth and a ball dropped into the hole at one end, it will not pop out of other end of the hole. STATEMENT-2 : It should come out of the othe end normally.

A ball of mass m is attached to the lower end of a vertical string whose upper end is fixed. An identcial ball 'B' moving with a velocity v_(0) = 6 m//s at an angle theta = 45^(@) from vertical collides elastically with the ball 'A' as shown. The verocity of the ball 'B' just after collision is

The cylinderical tube of a spray pump has radius R, One end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is :

A current i is uniformly distributed over the cross section of a long hollow cylinderical wire of inner radius R_1 and outer radius R_2 . Magnetic field B varies with distance r form the axis of the cylinder is

In the figure , mass of a ball is 9/5 times mass of the rod, Length of rod is 1m.The level of ball is same as rod level.Find out time taken by the ball to reach at upper end of rod.