A superconducting wire carries a current of 1.0 × 10^4 A. Find the magnetic field at a distance of 1.0 m from the wire
2.0 × 10^-3 T
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RMS and Peak Quantities: The peak current and voltage outputs of a generator are 20 A and 240 V, respectively. What average power is provided by the generator?
Fill in the blank(s) with the appropriate word(s).
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every ?T, no matter how large or how small ?T is, but that the constant is different for different substances. Which one, if either, is correct?
A. Neither, because the specific heat depends on the substance and may vary with temperature. B. Neither, because a change of state may involve release or absorption of latent heat. C. Neither because a substance may do work during a temperature change. D. All of the statements above are correct. E. Only statements (a) and (b) are correct.
A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2 . In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
a. 2.5 s b. 4.0 s c. 3.5 s d. 3.0 s e. 4.5 s
The predominant method of heat transfer to a cold drink held in an evacuated bottle (a thermos) is by ________
a. conduction b. convection c. radiation