"The total charge of the isolated system is always conserved". How?

Show that in an isolated system linear momentum is conserved.

Is first law a conservation law? How?

Show that the total linear momentum of a system of particles is equal to the product of the total mass of the system and the velocity of its centre of mass.

The nearest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallax would this star (named Alpha Centauri) show ,when viewed from two locations of the Earth six months apart* in its orbit around the Sun?

"Charges are conserved".Describe.

Is work to be done to move a charge on a surface of an isolated charged conductor ?

Fill in the blanks The total charge of the electric dipole is ___

The rate of change of total momentum of a many-particle system is proportional to the external force/sum of the internal forces on the system.