Three equal positive charges are placed on the x-axis, one at the origin, one at x = 4 m, and the third at x = 7 m. Of the following points, which has the greatest magnitude electric field?
a. x = 3 m
b. x = 5.5 m
c. x = 8 m
d. The electric field has the same magnitude at all three positions.
e. x = 0 m
c
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The law of conservation of energy:
a. fails because energy increases too fast as the speed gets closer to c. b. does not apply to the theory of special relativity. c. applies to the theory of special relativity as long as the relativistic adjustment factor is correctly included. d. applies to any given inertial system but not to others. e. applies to the theory of special relativity in exactly the same form as it applies for small velocities.
What is the magnitude of a the vertical electric field that will balance the weight of a plastic sphere of mass that has been charged to -3.0 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A) 6.9 × 106 N/C B) 7.8 × 105 N/C C) 1.5 × 106 N/C D) 2.1 × 106 N/C
The energy released by the Sun is the outcome of atomic nuclei
1) breaking apart, 2) combining together, and radioactive by-products are a chief result of atomic nuclei 3) breaking apart. 4) combining together. 5) doing neither.