Two point charges of magnitude + 7.00 ?C and - 9.00 ?C are placed along the x-axis at x = 0 cm and x = 40.0 cm, respectively
Where must a third charge, q, be placed along the x-axis so that it does not experience any net force because of the other two charges? A) 0.200 m
B) 2.99 m
C) - 0.187 m
D) - 2.99 m
E) 0.187 m
D
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Resistors in Combination: Each of the resistors shown in the figure has a resistance of 180.0 ?. What is the equivalent resistance between points a and b of this combination?
A. 450.0 ? B. 720.0 ? C. 540.0 ? D. 180.0 ?
A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m2. What are the amplitudes of the electric and magnetic fields of this wave?
(c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
As the ac frequency in an RLC circuit is increased to very high values, which of the contributions to the impedance dominates?
A. the capacitive reactance B. the inductive reactance C. the resistance D. the combined capacitive reactance and the resistance E. More information is needed.
A very fine thread is placed between two glass plates on one side and the other side is touching to form a wedge. A beam of monochromatic light of wavelength 600 nm illuminates the wedge and 178 bright fringes are observed
What is the thickness of the thread? A) 22.3 ?m B) 26.7 ?m C) 32.3 ?m D) 53.3 ?m E) 76.3 ?m