The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from 2.0 × 10^–3 T to 3.5 × 10^–3 T in 0.47 s. What is the induced emf in the wire?
a. 9.0 ×10–4 V b. 2.3 ×10–4 V
c. 1.8 ×10–3 V d. 1.8 ×10–4 V
a
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A nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m3. What is the magnitude of the potential difference between the center and a point 4.0 cm away?
A. 12 V B. 6.8 V C. 3.0 V D. 4.7 V E. 2.2 V
Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. How large is the shift in wavelength?
A) 2 nm B) 0.2 nm C) 0.02 nm
Fusion of degenerate hydrogen on the surface of a white dwarf causes temperatures to reach millions of degrees and the density tens of thousands the density of water releasing enough energy to blow the surface layers, resulting in a(n) _______________
Fill in the blank(s) with correct word
The nucleus of an atom is composed of protons and neutron held together by the
a. binding energy. b. strong nuclear force. c. fusion. d. fission.