A long solenoid (diameter = 5.0 cm) is wound with 960 turns per meter of thin wire through which a current of 300 mA is maintained. A wire carrying 12 A is inserted along the axis of the solenoid. What is the magnitude of the magnetic field at a point 2.0 cm from the axis?
a. 0.41 mT
b. 0.48 mT
c. 0.38 mT
d. 0.56 mT
e. 0.24 mT
C
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The figure above shows how the luminosity of supernovae changes over time. About how long does it take a white dwarf supernova to decrease in luminosity by a factor of 100 from its peak?
A) 300 days B) 200 days C) 100 days D) 25 days
An RC circuit consists of 2.0 M? in series with a capacitor. When connected to a battery, the capacitor becomes 25% charged in 1.5 seconds. What is the capacitance value?
What will be an ideal response?
Meteor showers are
A) usually annual events, as the orbits again intersect. B) caused by the Earth passing near the orbit of an Earthgrazing asteroid. C) caused by the Earth passing near the orbit of an old short-period comet. D) Both A and B are correct. E) Both A and C are correct.
The weight of a car of mass 1.20 × 103 kg is supported equally by the four tires, which are inflated to the same gauge pressure
What gauge pressure in the tires is required so the area of contact of each tire with the road is 1.00 × 102 cm2? (1 atm = 1.01 × 105 Pa.) A) 2.94 × 105 Pa B) 2.94 × 103 Pa C) 11.6 × 104 Pa D) 2.94 × 104 Pa E) 11.6 × 105 Pa