Reactance: A pure capacitor is connected to an ac power supply. In this circuit, the current
A. leads the voltage by 90°.
B. lags the voltage by 90°.
C. lags the voltage by 180°.
D. is in phase with the voltage.
E. None of the given answers are correct.
Answer: A
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Consider point charges of +Q and +4Q, which are separated by 3 m. At what point, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic force acting on it would be zero?
A) 3/5 m from the +Q charge B) 1 m from the +Q charge C) 1 m from the +4 charge D) 3 m from the +4 charge E) There is no such point possible.
During a collision, which of these is an indication that the total momentum has changed?
A. Heat is generated, deformation occurs, and sound is produced B. Deformation occurs C. Sound is produced D. Heat is generated E. None of these choices are correct
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A) nonsense. B) a significantly better result than adding them classically. C) a classical result.
Which star will emit the shortest wavelength of its peak frequency?
A) a blue star B) a yellow star C) a red star D) a green star