Ways by which static electric current can be produced

solar panels

sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.

as technology advances, new experiments often expose problems in accepted theories. c

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-lavira: )