Physics > QUESTIONS & ANSWERS > Hunter College, CUNY PHYS 120 prep 9. (All)
Hunter College, CUNY PHYS 120 prep 9.
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14) Two tiny particles carrying like charges of the same magnitude are apart. If the electric force on one of them is what is the magnitude of the charge on each of these particles?(k = 1/4πε0 = 9 ... .0 × 109 N ∙ m2/C2) A) 2.4 × 10-2 C B) 2.4 × 10-8 C C) 4.5 × 104 C D) 2.4 × 10-5 C Answer: B Given, F=5.0 N d=1.0 mm=0.001 m k=9.0*109 F=kq1q2/d2 Here, q1=q2=q F=kq2/d2 5.0=9*109*q2/0.0012 q=2.4*10-8 C 15) How far apart should two protons be if the electrical force of repulsion on each one is equal to its weight on the earth? (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2, e = 1.6 × 10-19 C, mproton = 1.67 × 10-27 kg) Answer: 12 cm Var: 1 [Show More]
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