Created by StemPy LabAt a certain point and instant, the electric field of a plane electromagnetic wave points in the direction, and its magnetic field points in the direction. The wave is travelling in the
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← A steady current flows through a coil of inductance 2 H. The battery is then removed and, at the same instant, the coil is connected across a 4 Ω resistor (the total resistance of the circuit). How long does it take for the current to fall to one quarter of its starting value?An optical fibre has a glass core of refractive index 1.50, surrounded by a cladding of refractive index 1.40, as shown in the figure. Light enters the flat end of the fibre from air. What is the largest angle with the fibre's axis at which a ray can enter and still be trapped inside the core by total internal reflection? →
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