Answer the following questions:Interstellar space has an extremely weak magnetic field of the order of `10^-12` T.Can such a weak field be of any significant consequence? Explain.

Answer the following questions: A certain region of space is to be shielded from magnetic fields. Suggest a method.

Answer the following questions: Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher fields?

Answer the following questions regarding earth’s magnetism: f you made a map of magnetic field lines at Melbourne In Australia, would the lines seem to go Into the ground or come out of the ground?

Answer the following questions: A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal the initial speed if it suffered no collisions with the environment?

Answer the following questions regarding earth’s magnetism:The earth’s field, It Is claimed, roughly approximates the field due to a dipole of magnetic moment 8 xx 10^22 J "T1 located at Its centre. Check the order of magnitude of this number In some way.

Answer the following questions: Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.) Why?

Answer the following questions:An electron travelling west to east enters a chamber having a uniform electrostatic field in north to south direction. Specify the direction in which a uniform magnetic field should be set up to prevent the electron from deflecting from its straight line path.

Answer the following questions: The earth’s magnetic field varies from point to point in space. Does it also change with time? If so, on what time scale does it change appreciably?

Answer the following questions: A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path with constant speed. What can you say about the initial velocity of the particle?

Answer the following questions:The earth may have even reversed the direction of Its field several times during its history of 4 to 5 billion years. How can geologists know about the earth’s field in such distant past?