The magnetic flux through a coil changes steadily from 4.0 × 10-5 T ? m2 to 5.0 × 10-5 T ? m2 in 0.10 s. What emf is induced in this coil?
A) 5.0 × 10-4 V
B) 4.0 × 10-4 V
C) 1.0 × 10-4 V
D) None of the given answers are correct.
C
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According to quantum field theory, what happens when two charged particles exert forces on each other?
A) Each particle causes the other particle's matter field to vibrate more rapidly. B) The two particles exchange their matter fields with each other. C) An electromagnetic wave passes from one particle to the other. D) Electrons are exchanged between them. E) Photons are exchanged between them.
Electric fields that arise from changing magnetic fields have all the properties below except:
A. They terminate on electric charges. B. They cannot be described by an electric potential. C. Their field lines take the form of closed loops. D. Work done by the field along a closed path may be non-zero.
Some gamma-ray bursts last only a few seconds and do not appear to come from supernovae. What is the leading hypothesis for the origin of short these gamma-ray bursts?
A) new stars forming in the Milky Way B) bursts of fusion occurring on the surfaces of white dwarfs in binary systems C) bursts of fusion occurring on the surfaces of neutron stars in binary systems D) The explosion of a white dwarf E) The mergers of two neutron stars
The variations in the angle at which the Sun's rays strike Earth's surface give us the seasons. Name four physical factors that contribute to the Earth's seasons. (Hint: Think of the big picture.)
What will be an ideal response?