A stone tied to a string of length l is whirled around a vertical circle with the other end of the string at the centre. At a certain instant of time the stone is at the lowest position and has a speed u. What is the magnitude of change in its velocity as it reaches […]
How can an alternating current change its direction while moving in a wire or any conductor? Why direct currents aren’t used in Home circuits?
Alternating current is produced by rotating a coil in a strong magnetic field (or …