What current in a solenoid 15.0-cm long wound with 100 turns would produce a magnetic field equal to that of the Earth, 5.00 × 10^?5 T?
59.7 mA
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Equipotentials are lines along which
A. the electric field is constant in magnitude and direction. B. the electric charge is constant in magnitude and direction. C. maximum work against electrical forces is required to move a charge at constant speed. D. a charge may be moved at constant speed without work against electrical forces. E. charges move by themselves.
A simple series circuit consists of just a 3.4-µF capacitor and an 80-mH inductor, with no appreciable resistance. At t = 0 the capacitor has charge 5.4 µC and the current in the inductor is zero
(a) How long after t = 0 will the current in the circuit be maximum? (b) What will be this maximum current?
A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced?
A) 11 MJ B) 3.0 kJ C) 0.18 MJ D) 1.5 kJ
Which of the following best describes why we have seasons on Earth?
A) The tilt of Earth's axis causes different portions of the Earth to receive more or less direct sunlight at different times of year. B) The varying speed of Earth in its orbit around the Sun gives us summer when we are moving fastest and winter when we are moving slowest. C) The tilt of Earth's axis causes the northern hemisphere to be closer to the Sun than the southern hemisphere in summer, and vice versa in winter. D) Earth's elliptical orbit means we are closer to the Sun and therefore receive more intense sunlight at some times of year than at others.