Answer the following statement(s) true (T) or false (F)
1. The electric field inside a conductor must be zero in all possible circumstances.
2. In static equilibrium, any excess charge on a conductor is uniformly spread on its surface.
3. A closed metal can (in static equilibrium) will perfectly shield a point in its interior from the static field of any external charged particle(s).
4. If the electric field at any point inside a conductor is nonzero, the metal is not in static equilibrium.
1. FALSE
2. FALSE
3. TRUE
4. TRUE
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In a region of space where the magnetic field of the Earth has a magnitude of 80 ?T and is directed 30° below the horizontal, a 50-cm length of wire oriented horizontally along an east-west direction is moved horizontally to the south with a speed of 20 m/s. What is the magnitude of the induced potential difference between the ends of this wire?
A. 0.45 mV B. 0.35 mV C. 0.30 mV D. 0.40 mV E. 0.69 mV
Two asteroids have identical masses. However, one asteroid is twice as far from the Sun than the other. According to Newton's Universal Law of Gravitation the force of gravity exerted by the Sun on the more distant asteroid is
A) the same size as the force exerted on the closer asteroid B) one-quarter of the size of the force exerted on the closer asteroid C) twice as large as the force exerted on the closer asteroid D) one-half of the size of the force exerted on the closer asteroid
The Mercalli scale measures an earthquake's
A) effects. B) damage. C) intensity. D) intensity, damage, and overall effect.
Lunar eclipses last longer than solar eclipses because
a) the Moon is much farther from Earth during a lunar eclipse. b) the diameter of Earth is much greater than the diameter of the Moon. c) Earth's period of rotation is always greater during a lunar eclipse than during a solar eclipse. d) the lunar shadow is only a penumbra with no dark umbra region to extend the length of the eclipse.