Magnetic Field of a Long Wire: How much current must flow through a long straight wire for the magnetic field strength to be 1.0 mT at 1.0 cm from a wire? (?0 = 4? × 10-7 T ? m/A)
A. 50 mA
B. 9.2 A
C. 16 A
D. 50 A
E. 5.0 mA
Answer: D
You might also like to view...
What is the wavelength of the matter wave associated with a 0.50-kg ball moving at 25 m/s? (h = 6.626 × 10-34 J ? s)
A) 3.5 × 10-35 m B) 5.3 × 10-35 m C) 3.5 × 10-33 m D) 5.3 × 10-33 m
Igneous rocks are formed by the
A) melting and transformation of minerals in Earth's interior. B) cooling and crystallization of molten magma. C) partial crystallization of granitic magma. D) cooling and crystallization of molten lava in Earth's interior.
The length of a 25-m wire increases by 0.25 cm when it is heated from 20°C to 90°C. What is the coefficient of linear expansion of the wire?
a. 1.43 × 10^–6/ºC b. 1.43 × 10^–4/ºC c. 8.93 × 10^–4/ºC d. 8.93 × 10^–2/ºC
An air bubble underwater has the same pressure as that of the water. As the air bubble rises toward the surface (and its temperature remains constant), the volume of the air bubble
A) increases. B) decreases. C) remains constant. D) increases or decreases, depending on the rate it rises.