A 10-mH inductor is connected in series with a 10-ohm resistor, a switch and a 6-volt battery. What is the time constant of the circuit? How long after the switch is closed will the current reach 99 percent of its final value?
1.0 ms, 4.6 ms
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A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current because the free electrons in the moving wire experience a force from the magnetic field that pushes them through the wire
Indicate whether the statement is true or false
In order to have a global magnetic field, a planet must have
A) an electrically conducting fluid in its interior which is undergoing convection and a reasonably rapid rotation B) magnetic rocks in its interior C) magnetic rocks on its surface D) a large core of solid magnetized iron
What is the focal length of the combined lenses with individual powers of 8.0 diopters and 4.0 diopters?
A) 8.0 cm B) 5.6 cm C) 6.0 cm D) 8.3 cm E) 4.0 cm
The Moon always keeps the same side facing Earth and therefore Earth always keeps the same side facing the Moon
a. True b. False Indicate whether the statement is true or false