Magnetism and Matter Set 4

Susceptibility of at is . The temperature at which susceptibility will be is

A magnet of magnetic moment - is placed along the -axis in a magnetic field . The torque acting on the magnet is

A dip circle is at right angles to the magnetic meridian.

A small bar magnet oscillates in a horizontal plane with a period at a place where the angle of dip is . When the same needle is made to oscillate in a vertical plane coinciding with the magnetic meridian, its period will be

The basic magnetization curve for a ferromagnetic material is shown in figure. Then, the value of relative permeability is highest for the point

Two short magnets with pole strengths of 900 ab amp-cm and 100 ab-amp-cm are placed with their axes in the same vertical line, with similar poles facing each other. Each magnet has a length of 1 cm. When separation between the nearer poles is 1 cm, the weight of upper magnet is supported by the repulsive force between the magnets. If g, then the mass of upper magnet is

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show

To shield an instrument from external magnetic field, it is placed inside a cabin made of

Two identical magnetic dipoles of magnetic moment 2 are placed at a separation of 2 m with their axis perpendicular to each other in air. The resultant magnetic field at a mid-point between the dipoles is

A magnet makes 40 oscillations per minute at a place having magnetic field intensity of . At another place, it takes to complete one vibration. The value of earth's horizontal field at that place is+