A Young's interference experiment is conducted with violet argon laser light (? = 409 nm). The separation between the slits is 0.66 mm, and the interference pattern appears on a screen 3.8 m away. What is the spacing between the bright fringes? (1 nm = 10?9 m)
a. 1.5E–3 m
b. 2.4E–3 m
c. 1.5E+4 m
d. 4.7E–3 m
e. 1.6E–3 m
b
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Imagine a small magnet with its north pole vertically upward passing near the south pole of an external magnet that is above the small magnet. In what direction does the net force acting on the magnet point?
A. Upward. B. Downward. C. There is zero net force. D. None of the above (explain).
Vector V1 is (5i + 7j - 3k) and vector V2 is (7i + 2 j + 14k). The component of V1 parallel to the line of action of vector V2 is:
(A) -0.25i + 0.12j + 0.43k (B) 0.20i + 0.06j + 0.39k (C) -0.20i + 0.22j + 0.39k (D) -0.35i + 0.02j + 0.13k
A Nichrome wire has a radius of 1.3 mm and a resistivity of 1.5 × 10^?6 ??m. If the wire carries a current of 1.8 A, what is the potential difference per unit length along this wire?
a. 0.19 V/m b. 0.51 V/m c. 0.66 V/m d. 6.4 V/m e. 5 V/m
Three point charges, two positive and one negative, each having a magnitude of 20 ?C are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on the negative charge?
a. 80 N b. 40 N c. 69 N d. 57 N e. 75 N