A solenoid of length 18 cm consists of closely spaced coils of wire wrapped tightly around a wooden core. The magnetic field strength is 2.0 mT inside the solenoid near its center when a certain current flows through the coils
If the coils of the solenoid are now pulled apart slightly, stretching it to 21 cm without appreciably changing the size of the coils, what does the magnetic field become near the center of the solenoid when the same current flows through the coils? (?0 = 4? × 10-7 T • m/A)
A) 1.7 mT
B) 3.4 mT
C) 0.85 mT
D) 2.0 mT
A
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Some giant elliptical galaxies are found to have disks of gas and dust with star forming regions, and are probably the result of ________
Fill in the blank(s) with correct word
What is the energy required to remove the electron from a hydrogen atom in the n = 11 state?
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What is the number of photons per second given off by a light bulb with a power of 100 Watts operating at an efficiency of 4.80%? Assume the wavelength of light to be 600 nm
A) 6.34 × 1018 photons/s B) 5.42 × 1018 photons/s C) 3.11 × 1018 photons/s D) 25.3 × 1018 photons/s E) 14.5 × 1018 photons/s