Earth's magnetic field has reversed itself
a. True
b. False
Indicate whether the statement is true or false
True
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Nuclear Binding Energy: The neutral helium atom, 
He, has a mass of 4.002603 u, a neutron has a mass of 1.008665 u, a proton has a mass of 1.007277 u, and a neutral hydrogen atom has a mass of 1.007825 u. What is the binding energy of the 
He nucleus? (1 u = 931.5 MeV/c2)
A. 20.5 MeV B. 22.4 MeV C. 27.3 MeV D. 28.3 MeV E. 23.4 MeV
Which of the beams is due to a positively charged helium nucleus?
A) a B) b C) c D) all of the above E) none of the above
A capacitor consists of a set of two parallel plates of area A separated by a distance d. The capacitor plates carry charges +Q and -Q. If the separation between the plates is doubled, the electrical energy stored in the capacitor will
A) double. B) quadruple. C) be cut in half. D) be cut in fourth. E) not change.
The reason the north pole of a bar magnet free to rotate points north is because
a. the south geographic pole of the earth is the earth's magnetic north pole. b. the south geographic pole of the earth is the earth's magnetic south pole. c. there is a net accumulation of negative magnetic charge at the earth's south geographic pole. d. there is a net accumulation of positive magnetic charge at the earth's north geographic pole. e. the north geographic pole of the earth is the earth's magnetic north pole.