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  1. S

    Magnetic Field and E Fields

    1. An electron has an initial velocity of (11.0 j + 16.0 k) km/s and a constant acceleration of (2.00 1012 m/s2) i in a region in which uniform electric and magnetic fields are present. If B = (400 µT) i, find the electric field E. [B] i. [B] j...
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    Current Density of protons

    o, i cannot believe i mistook that info. Thanks.
  3. S

    Current Density of protons

    Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 8.90 cm-3 and their speed is about 490 km/s. (a) Find the current density of these protons. (b) If Earth's magnetic field did not deflect the protons, what total current would Earth receive? For...
  4. S

    Current Density and Current

    Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 8.90 cm-3 and their speed is about 490 km/s. a. Find the current density of these protons. b. If Earth's magnetic field did not deflect the protons, what total current would Earth receive?
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    Coulombs Law and electrostatic force

    i maybe missing something obvious, but i dont see why it is 3/8.
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    Centripetal Acceleration of astronaut

    Anyone know how to do this? An astronaut is rotated in a horizontal centrifuge at a radius of 8.0 m. (a) What is the astronaut's speed if the centripetal acceleration is 7.0g? (b) How many revolutions per minute are required to produce this acceleration? (c) What...
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