Question

Why does the terminal at higher voltage indicate the current is flowing out of the solenoid and the lower voltage indicate the current is flowing into the solenoid?

Answer 1

THE DIRECTION OF CURRENT IN A SOLENIOD IS GIVEN BY LENZ'S LAW. LENZ'S LAW STATES THAT THE DIRECTION OF INDUCED EMF/CURRENT IN A SOLENIOD WILL BE SUCH THAT IT OPPOSES THE CAUSE OR THE SOURCE THAT PRODUES IT. SNICE THE SOURCE HERE IS THE CURRENT WHICH FLOWS FROM HIGHER VOLTAGE TERMINAL TO LOWER VOLTAGE TERMINAL AND PRODUCES FIELD AND THE DIRECTION OF INDUCED EMF/CURRENT WILL BE OPPOSITE TO THE ORIGINAL ONE.THAT IS WHY LEAVING CURRENT DENOTES HIGH VOLTAGE TERMINAL AND ENTERING DENOTES LOW VOLTAGE TERMINAL ..