The power of the lens is +2.5D. What is the radius of the curvature?
The reason for having a large number of turns in the coil of a moving coil galvanometer is to--------
Current is passed through two parallel conductors in the same direction. If the conductors are placed near each other, they will------------------
The period of a 10 kHz radio wave traveling at 10\(^{8}\) ms\(^{-1}\) is--
The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called