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?

A short bar magnet of magnetic moment 5.25xx10^(-2)J.T^(-1) is placed with its axis perpendicular to the earth's magnetic field . At what distance from the centre of the magnet , the magnet , the resultant field is inclined at 45^(@) with the earth's field on its axis Ignore the length of the magnet in comparison to the distance involved .

A short bar magnet of magnetic moment 5.25xx10^(-2)J.T^(-1) is placed with its axis perpendicular to the earth's magnetic field . At what distance from the centre of the magnet , the magnet , the resultant field is inclined at 45^(@) with the earth's field on its normal bisector

How does the magnetic field at a point near a long straight current-carrying conductor vary with the current and the distance of the point ?

Does the colour of petals can change (with change in attitude, season, day time)?

Determine the electric field at a point near a charged conductor. How does this value change at various points near the surface of an irregular shaped conductor?

A wire loop of area A is placed in a uniform magnetic field B so that the directio of B is parallel to the plane of the coil. If B changes with time the emf induced in the loop will be

The horizontal component of earth's magnetic field at a place is sqrt(3) Time the vertical component. What is the angle of dip at this place?