Two long parallel wires 40 cm apart are carrying currents of 10 A and 30 A in the opposite direction. What is the magnitude of the magnetic field halfway between the wires?
a. 3.0 × 10^–5 T
c. 1.0 × 10^–5 T
b. 2.0 × 10^–5 T
d. 4.0 × 10^–5 T
D
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Kepler's three laws of planetary motion were useful but not considered fully explained until
A. Galileo developed the telescope for astronomical observation. B. Pythagoras developed his famous theorem about right triangles and the Golden Ratio. C. Vivaldi composed his astronomical concerto, "The Four Seasons." D. Newton introduced the law of universal gravitation for astronomical and terrestrial objects.
The focal length of a glass lens depends on
A. both the index of refraction of the glass and the intensity of the light passing through the lens. B. the curvature of the surface of the lens. C. the index of refraction of the glass. D. both the curvature of the surface of the lens and the index of refraction of the glass. E. the intensity of the light passing through the lens.
A fused combination of a diverging and converging lens pair each made from a different index of refraction glass, is used to reduce the occurrence of which of the following effects?
a. spherical aberration b. mirages c. chromatic aberration d. light scattering
Liquid crystal displays make use of interference of light
Indicate whether the statement is true or false