2) An electron traveling along the x-axis enters an electric field directed vert

Question

2) An electron traveling along the x-axis enters an electric field directed vertically up along the +y axis. What is the direction of the electric force on the electron? A) Upward. B) To the left. C) To the right. D) Downward. Explain: 3) Two long parallel wires carry currents of different magnitudes. If the current in each is doubled, what happens to the magnitude of the force between the wires? A) It is doubled B) It stays the same C) It is quadrupled D) It is reduced by a factor of 4. Explain: 4) A moving object's mass is twice its rest mass. To an observer at test, its length in direction of travel must therefore be: A) Twice its proper length. B) Four times its proper length. C) One-half its proper length. D) V. its proper length. Explain 5) If the wavelength of a photon is doubled, what happens to its energy? A) It is doubled B) It stays the same C) It is quadrupled D) It is reduced by a factor of 2. Explain:

Explanation / Answer

2) F = q E
since q is negative f is oppsosite to E, so downward D)

3) F = u0 I1 I2/2 pi r

so doubling I will quadruple 4 so C)

4) so gamma = 2

so L = L0/gamma so haled to C)

5) E = hc/lambda

so double lambda halves E so D)

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