A rectangular coil of 100 turns measures 40.0 cm by 20.0 cm. This coil is placed next to an electromagnet which is switched on, increasing the magnetic field through the coil from zero to 0.800 T in 50.0 ms. If the resistance of the coil is 2.0 ohms, what are the induced voltage and current in the coil?
128 V, 64 A
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A flat horizontal plate of area 400 cm2 is dragged over a 0.20 cm thick layer of oil at a speed of 30.0 cm/s. The oil is resting on a fixed horizontal surface. It takes a force 1.20 N applied to the plate to sustain this speed
What is the viscosity of the oil? A) 6.00 kg/m • s B) 20.0 kg/m • s C) 60.0 kg/m • s D) 0.200 kg/m • s E) 200 kg/m • s
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What will be an ideal response?
Which of the following best describes the orbits of stars in the halo?
A) Halo stars have orbits confined to a relatively thin plane. B) Halo stars have elliptical orbits, with random orientations. C) Halo stars have elliptical orbits, but all orbiting in the same direction. D) Some halo stars orbit around the galactic center but others never pass through the plane of the galactic disk. E) Halo stars orbit the centers of their globular clusters, but do not orbit the center of the galaxy.
A solenoid with 568 turns, 0.19 m long, carrying a current of 3.5 A and with a radius of 10?2 m will have what strength magnetic field at its center? (magnetic permeability in empty space µ0 = 4? × 10^?7 T?m/A)
a. 1.2E–1 T b. 3.3E–3 T c. 2.5E–3 T d. 1.3E–2 T e. 4.1E–2 T