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A capacitor with initial charge q0 is discharged through a resistor. What multiple of the time constant τ gives the time the capacitor takes to lose (a) the first 1/5-th of its charge and (b)4/5-th of its charge?
Two slits are 0.42 mm apart and sit 0.9 m from a screen. A lasershines through the slits so that the distance between the centralpeak and the 4 th maximum is 10.2 cm. What is the angle of thelight that creates the 4 th maximum? At what wavelength is thelaser operating?
a conducting loop in th eshape of a square of edge length l=0.400m carries a current I=10.0A. calculate the magnitude and direction of the magnatic field at the center of the squere?