Obtain the formula, I = k θ for a moving coil galvanometer, given, the deflecting torque where m is the magnetic dipole moment of the coil placed in the magnetic field B, I is the current in the galvanometer and θ is the deflection.
(i) Define the terms magnetization (M) and magnetic susceptibility (xm).
(ii) What is the value of the magnetic susceptibility of aluminium if its relative permeability is 1.000022 ?
Two electromagnetic waves are :
(i) Radio waves
(ii) Light waves
Similarity : Both radio waves and light waves do not require any medium for their propagation.
Difference : Radio waves diffract prominently around buildings as the wavelength of radio waves is of the same order of magnitude as the size of the building or other obstacle. The light waves do not diffract as the wavelength of light waves is very small as compared to the size of building.