Question

Require some hint to approach the problem

How can we identifying whether or not the given measurements of maxima and minima belonged to a single slit or double slit experiment ?

How a magnet behaved in earths magnetic field ?

What formula should be used to dentify the charge of a mystery material?(electrostatics)

Answer 1

2) Freely suspended magnet always points in the North-South direction even in the absence of any other magnet. This is because Earth itself behaves as a magnet which causes a freely suspended magnet to point always in a particular direction: North and South. The shape of the Earth's magnetic field resembles that of a bar magnet of length one-fifth of the Earth's diameter buried at its center.

3)Gauss's Law -The net electric flux through any hypothetical closed surface is equal to 1/? times the net electric charge within that closed surface.

Gauss's law may be expressed as:

where ?_E is the electric flux through a closed surface S enclosing any volume V, Q is the total charge enclosed within V, and ?₀ is the electric constant. The electric flux ?_E is defined as a surface integral of the electric field: s

where E is the electric field, dA is a vector representing an infinitesimal element of area of the surface.