Microphone
Transmitter
Amplifier
Speaker
The device which transfer the signal from low resistance region to high resistance region is
The dielectric strength of transformer oil should be of the order of
The dimension MLT-2 corresponds to
The dimensional formula for universal gravitational constant is
The dimensional formula ML-1T -2 corresponds to
The dip of a magnetic needle will be zero
The direction of heat flow between two objects depends on
The distance between node & adjacent antinode is 30 cm. The wavelength is
The dynamo converts
The earth is a
