Created by StemPy LabA capacitor is connected across a , AC supply. Its reactance and the rms current are closest to
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← The magnetic flux through a single loop of wire changes with time as Φ = 5t² - 4t + 1, where Φ is in milliwebers and t in seconds. The loop has a resistance of 4 Ω. At t = 2 s, the induced emf and the current in the loop areA thin convex lens of focal length 20 cm and a thin concave lens of focal length 10 cm are placed on the same axis, 5 cm apart, as shown in the figure. The focal length of the combination is →
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