? A bar magnet has a magnetic moment equal to 5 x 10?5 weber x metre . it is suspended in a magnetic field which has magnetic induction B equal to 8p x 10?4 tesla . The magnet vibrates with a period off vibration equal to 15 sec . The moment of inertia of magnet is
A very long magnet is placed vertically with one pole on the table . A neutral point was found at 20 cm from the pole. What is the pole streght if the vertical component of earth’s field is 0.4 x 10?4Wb/m² ?
Two identical bar magnets are suspended first with their like poles on each other and then with unlike poles on each other. If T1 , T2 are respective time periods of oscillation in two configurations , then T1/T2 is
Magnetic field produced by electrons in atoms and molecules is due to their
An iron rod B is moved vertically on an another iron rod A . Rod B is always attracted by rod A in all Position then
Which one of the following statements is correct ?
A neutral point in the magnetic field is a point where
The time period of a freely suspended magnet does not depend upon
Potential energy of a bar magnet of magnetic moment M place in a magnetic field of induction B such that it makes an angle ? with the direction of B is
If at a certain place the horinzontal and vertical components of earth’s magnetic field are H and V and the angle of dip is ? , then
Of dia , para and ferromagnetism , the universal property of all substances is
Which of the following is a ferro-magnetic substance
Which of the following is most suitable for the sore of electromagnets
Torques t1 and t2 are required for a magnetic needle to remain perpendicular to the magnetic fields B1 and B2 at two different places . The ratio B1 /B2 is
A copper rod is suspended in a non homogenous magnetic field region . The rod when in equilibruim will align itself
The magnetic needle of an oscillation magnetometer makes 10 oscillations per minute under the action of earth's magnetic field alone. When a bar magnet is placed at some distances alon the axis of the needle,it makes 14 oscillations per minute. If bar magnet is reversed,then the new frequesncy of oscillations per minute . If the bar magnet is reversed, Then the new frequency of oscillation of the needle is
The susceptibility of a paramagnetic material is K at degree C. At what temperature will its suceptibility K/2 ?
A magnet loses its magnetism when it is
Earth's magnetic field always has a horizontal component except at
Three identicaal bar magnets each of magnetic moments M are arranged in the form of an equilateral triangle such that unlike poles are in contact. The resultant magnetic moments is