Four identical point charges (+6.0 nC) are placed at the corners of a rectangle which measures 6.0 m × 8.0 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
a. 58 V
b. 63 V
c. 43 V
d. 84 V
e. 11 V
C
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Two objects are dropped from a bridge, an interval of 1.0 s apart. Neglect air. During the time that both objects continue to fall, their separation
A) increases. B) decreases. C) stays constant. D) increases at first, but then stays constant. E) decreases at first, but then stays constant.
A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the capacitance in this circuit?
A) 17 ?F B) 16 ?F C) 15 ?F D) 14 ?F E) 13 ?F
A particle (q = +5.0 ?C) is released from rest when it is 2.0 m from a charged particle which is held at rest. After the positively charged particle has moved 1.0 m toward the fixed particle, it has a kinetic energy of 50 mJ. What is the charge on the fixed particle?
a. ?2.2 ?C b. +6.7 ?C c. ?2.7 ?C d. +8.0 ?C e. ?1.1 ?C
The left-hand end of a glass rod is ground to a spherical surface. The glass has index of refraction 1.50. A small object 4.00 mm tall is placed on the axis of the rod, 37.0 cm to the left of the vertex of the spherical surface
The image is formed in the rod, 50.0 cm to the right of the vertex. (a) What is the magnitude of the radius of curvature of the spherical surface at the end of the rod? (b) What is the height of the image?