The absolute value of the electric potential at a distance of 4 m from a certain point charge is 200 V. What is the absolute value of this potential at a distance of 2 m from the same charge?
A) 200 V
B) 50 V
C) 400 V
D) 100 V
E) 600 V
C
Physics & Space Science
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A 7.5 × 1014 Hz laser emits a 7.7-?s pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m3. What is the amplitude of the electric field of the emitted waves? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
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