Assertion : Magnetic flux enclosed with a closed surface is always zero
Reason : Gauss law applies in the case of electric field and magnetic field both
Important Questions on Matter and Magnetism
Assertion : Ferromagnetic substance attracts the external magnetic field lines
Reason: Permeability of ferromagnetic substances is very high
Reason: The magnetic meridian of the earth is along the axis of rotation of the earth.
Assertion: A dip circle (used for dip measurement) is taken to geomagnetic equator. The needle is allowed to move in a vertical plane The needle will stay in any direction when it is release
Reason: At geomagnetic equator zero
Assertion: Diamagnetic materials can exhibit magnetism.
Reason: Diamagnetic materials have a permanent magnetic dipole moment.
Assertion: In high latitude, one sees colourful curtains of light hanging down from high altitudes.
Reason: The high energy charged particles from the sun are deflected to polar regions by the magnetic field of the earth.
