If a charge +Q is placed inside a hollow isolated conductor that is originally neutral and the charge does not touch that conductor at any time:
a. the inside surface of the conductor will become positively charged.
b. the outside surface of the conductor will become positively charged.
c. both the inner and outer surfaces will remain neutral.
d. both the inner and outer surfaces will become negative.
b
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How are interstellar bubbles of hot, ionized gas made?
A) by the collapse of a gas cloud to form stars B) by the ejection of planetary nebulae from low-mass stars C) by the winds of massive stars and supernovae explosions D) by collisions between the Milky Way and satellite dwarf galaxies E) by the rapidly rotating magnetic fields of pulsars
A simple pendulum and an object oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now accelerates downward uniformly at 2 m/s2, what is true about the periods of these two systems?
A) Both periods would remain the same. B) Both periods would increase. C) Both periods would decrease. D) The period of the pendulum would increase but the period of the spring would stay the same. E) The period of the pendulum would decrease but the period of the spring would stay the same.
A simple refracting telescope provides large magnification by employing
A) a short focal length objective and a short focal length eyepiece. B) a short focal length objective and a long focal length eyepiece. C) a long focal length objective and a short focal length eyepiece. D) a long focal length objective and a long focal length eyepiece.
A loop of radius r = 3.0 cm is placed parallel to the xy-plane in a uniform magnetic field = 0.75 T . The resistance of the loop is 18 ?
Starting at t = 0, the magnitude of the field decreases uniformly to zero in 0.15 seconds. What is the magnitude of the electric current produced in the loop during that time? A) 0.79 mA B) 3.9 mA C) 1.7 mA D) 2.1 mA E) 0.20 mA