The magnetic field near a current carrying wire is directly proportional to the distance from the wire
Indicate whether the statement is true or false
FALSE
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Radiation: Two identical objects are placed in a room with a temperature of 20°C. Object A has a temperature of 50°C, while object B has a temperature of 90°C. What is the ratio of the net power emitted by object B to the power emitted by object A?
A. 1.7 B. 2.8 C. 81 D. 17 E. 21
Which of the following aberrations does not apply to mirrors?
A) astigmatism B) chromatic C) spherical D) coma
If the volume of an object doubles with no change in mass, its density would be
A) half. B) double. C) unchanged.
The magnitude of the magnetic field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10-3 T. How much current is flowing through the wire? (?0 = 4? × 10-7 T ? m/
A) A) 30 mA B) 190 mA C) 19 mA D) 380 mA