Physics M.C.Q (1 Marks)

The time period of oscillation of a magnet in a vibration magnetometer is 1.5 seconds. The time period of oscillation of another magnet similar in size, shape and mass but having one-fourth magnetic moment than that of first magnet, oscillating at same place will be

To compare magnetic moments of two magnets by vibration magnetometer, 'sum and difference method' is better because

Two bar magnets of the same mass, length and breadth but magnetic moments M and 2M respectively, when placed in same position, time period is 3 sec. What will be the time period when they are placed in different position

A magnetic needle is made to vibrate in uniform field H, then its time period is T. If it vibrates in the field of intensity 4H, its time period will be

Vibration magnetometer before use, should be set

The period of oscillation of a magnet in vibration magnetometer is 2 sec. The period of oscillation of a magnet whose magnetic moment is four times that of the first magnet is

Two bar magnets with magnetic moments 2 M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth’s magnetic field with magnet having magnetic moment 2M making and angle q with the magnetic meridian such that

Time period for a magnet is T. If it is divided in four equal parts along its axis and perpendicular to its axis as shown then time period for each part will be

Two magnets of same size and mass make respectively 10 and 15 oscillations per minute at certain place. The ratio of their magnetic moments is

Vibration magnetometer is used for comparing

Time period of a freely suspended magnet does not depend upon

Magnetic moments of two bar magnets may be compared with the help of

The time period of oscillation of a freely suspended bar magnet with usual notations is given by

In sum and difference method in vibration magnetometer, the time period is more if

At a certain place a magnet makes 30 oscillations per minute. At another place where the magnetic field is double, its time period will be

At the magnetic poles of the earth, a compass needle will be

Let V and H be the vertical and horizontal components of earth's magnetic field at any point on earth. Near the north pole

Isogonic lines on magnetic map will have

At which place, earth's magnetism become horizontal

A bar magnet is situated on a table along east-west direction in the magnetic field of earth. The number of neutral points, where the magnetic field is zero, are

The horizontal component of the earth's magnetic field is 0.22 Gauss and total magnetic field is 0.4 Gauss. The angle of dip. is

Magnetic meridian is a

The direction of the null points is on the equatorial line of a bar magnet, when the north pole of the magnet is pointing

Which of the following relation is correct in magnetism

The value of angle of dip is zero at the magnetic equator because on it

A line passing through places having zero value of magnetic dip is called

Due to the earth's magnetic field, charged cosmic ray particles

Ratio between total intensity of magnetic field at equator to poles is

The magnetic field of earth is due to

A compass needle will show which one of the following directions at the earth's magnetic pole

The vertical component of the earth's magnetic field is zero at a place where the angle of dip is

Lines which represent places of constant angle of dip are called

When the N-pole of a bar magnet points towards the south and S-pole towards the north, the null points are at the

The earth's magnetic field at a certain place has a horizontal component 0.3 Gauss and the total strength 0.5 Gauss. The angle of dip is

The magnetic field due to the earth is closely equivalent to that due to

In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be

A bar magnet is placed north-south with its north pole due north. The points of zero magnetic field will be in which direction from the centre of the magnet

A dip circle is at right angle to the magnetic meridian. What will be the apparent dip

At a place, the magnitudes of the horizontal component and total intensity of the magnetic field of the earth are 0.3 and 0.6 Oersted respectively. The value of the angle of dip at this place will be

At the magnetic north pole of the earth, the value of horizontal component of earth's magnetic field and angle of dip are, respectively

The angle of dip at a place on the earth gives

The magnetic compass is not useful for navigation near the magnetic poles because