In the figure below, the current is measured with the ammeter at the bottom of the circuit. When the switch is opened, the reading on the ammeter
2
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A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 ? is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (?t), where A = 80 ?T and ? = 50? rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
A. 11 mA B. 18 mA C. 14 mA D. 22 mA E. zero
A 4.00 kg ball is traveling at 5.00 m/s and strikes a wall. The 4.00 kg ball bounces off the wall with a velocity of 4.0 m/s. The change in momentum of the ball is
A. 8.0 kg m/s. B. 13 kg m/s. C. 26 kg m/s. D. 30 kg m/s. E. 36 kg m/s.
Monochromatic light (? = 500 nm) is incident on a soap bubble (n = 1.40). How thick is the bubble (in nm) if destructive interference occurs in the reflected light?
A. 102 B. 179 C. 54 D. 1 E. 89
Three point charges are placed on the x-axis. A charge of +2.0 ?C is placed at the origin, -2.0 ?C to the right at x = 50 cm, and +4.0 ?C at the 100 cm mark
What are the magnitude and direction of the electrostatic force which acts on the charge at the origin?