Exercise

Assertion $\left(A\right)$ Flux of magnetic field $\overrightarrow{B}$ through a closed surface is equal to zero $\oint \overrightarrow{B}d\overrightarrow{s}=0$

Reason $\left(R\right)$ magnetic field lines are close curves, they don't have any beginning or end.

The earth's magnetic field is approximately 

The angle of dip at a certain place on earth is $60°$ and the magnitude of earth's horizontal component of magnetic field is $0.26 G$. The magnetic field at the place on earth is

Let $B_V$ and $B_H$ be the vertical and horizontal components of earth's magnetic field at any point on earth. Near the north pole

A substance is placed in a non-uniform magnetic field. It experiences weak force towards the strong field. The substance is type

The temperature at and above which a ferromagnetic material become paramagnetic is called

Which of the following property/properties should a material selected for making telephone diaphragms possess?

A carbon microphone is best used in a