A non-foliated metamorphic rock is
A) slate.
B) schist.
C) gneiss.
D) quartzite.
Answer: D
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Lenz's Law: A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held above the center of the coil with its south pole downward. The magnet is released from rest and falls toward the coil. As viewed from above, what is the direction of the current induced in the coil as the magnet approaches the coil?
A. counterclockwise B. clockwise C. No current is induced in the coil. D. An emf but no current is induced in the coil.
Two tiny particles having charges of +5.00 ?C and +7.00 ?C are placed along the x-axis. The +5.00-µC particle is at x = 0.00 cm, and the other particle is at x = 100.00 cm
Where on the x-axis must a third charged particle be placed so that the net electrostatic force exerted on it by the other two particles is zero? A) 4.58 cm B) 45.8 cm C) 50 cm D) 9.12 cm E) 91.2 cm
An ac generator contains 80 flat rectangular loops of wire, each of which is 12 cm long and 8 cm wide. The loops rotate at 1200 rpm about an axis through the center and parallel to the long side
If the magnetic field in which the loop rotates is uniform, has magnitude 0.30 T, and is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator? A) 20 V B) 27 V C) 35 V D) 29 V
A 40-turn circular coil (radius = 4.0 cm, total resistance = 0.20 ?) is placed in a uniform magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies with time as given by B = 50 sin(10 ?t) mT where t is measured in s. What is the magnitude of the induced current in the coil at 0.10 s?
a. 50 mA b. 1.6 A c. 0.32 A d. zero e. 0.80 A