Created by StemPy LabA steady current flows through a coil of inductance . The battery is then removed and, at the same instant, the coil is connected across a resistor (the total resistance of the circuit). How long does it take for the current to fall to one quarter of its starting value?
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← Two long straight wires lie in the plane of the page, crossing at right angles at the origin without touching. One runs along the x-axis and carries 10 A in the +x direction; the other runs along the y-axis and carries 10 A in the +y direction, as shown in the figure. Point P is at (5 cm, 5 cm) and point Q is at (-5 cm, 5 cm). The magnetic fields at P and at Q areAt a certain point and instant, the electric field of a plane electromagnetic wave points in the +y direction, and its magnetic field points in the -z direction. The wave is travelling in the →
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