Embibe Experts Solutions for Chapter: Matter and Magnetism, Exercise 1: Exercise-1

 A magnetic needle is kept in a non-uniform magnetic field. It experiences 

The magnetic lines of force inside a bar magnet 

A steel wire of length I has magnetic moment M. It is bent into a semi-circle. Now its magnetic moment is

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

Assertion : Ferromagnetic substance attracts the external magnetic field lines

Reason: Permeability of ferromagnetic substances is very high

Assertion: The true geographic north direction is found by using a compass needle.
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 $B_V=$zero

Assertion: Diamagnetic materials can exhibit magnetism.

Reason: Diamagnetic materials have a permanent magnetic dipole moment.